155642040 has 128 divisors (see below), whose sum is σ = 522028800. Its totient is φ = 41247360.

The previous prime is 155641999. The next prime is 155642057. The reversal of 155642040 is 40246551.

155642040 is a `hidden beast` number, since 15 + 5 + 642 + 0 + 4 + 0 = 666.

155642040 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 155641995 and 155642013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227539 + ... + 228221.

It is an arithmetic number, because the mean of its divisors is an integer number (4078350).

Almost surely, 2^155642040 is an apocalyptic number.

155642040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155642040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261014400).

155642040 is an abundant number, since it is smaller than the sum of its proper divisors (366386760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155642040 is a wasteful number, since it uses less digits than its factorization.

155642040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 155642040 is about 12475.6578984838. The cubic root of 155642040 is about 537.9091991239.

Adding to 155642040 its reverse (40246551), we get a palindrome (195888591).

The spelling of 155642040 in words is "one hundred fifty-five million, six hundred forty-two thousand, forty".