155442240 has 168 divisors, whose sum is σ = 554736000. Its totient is φ = 41430528.

The previous prime is 155442229. The next prime is 155442241. The reversal of 155442240 is 42244551.

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

It is not an unprimeable number, because it can be changed into a prime (155442241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76761 + ... + 78759.

It is an arithmetic number, because the mean of its divisors is an integer number (3302000).

Almost surely, 2^155442240 is an apocalyptic number.

155442240 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 155442240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277368000).

155442240 is an abundant number, since it is smaller than the sum of its proper divisors (399293760).

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

155442240 is an equidigital number, since it uses as much as digits as its factorization.

155442240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031 (or 2009 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 155442240 is about 12467.6477332334. The cubic root of 155442240 is about 537.6789265498.

Adding to 155442240 its reverse (42244551), we get a palindrome (197686791).

The spelling of 155442240 in words is "one hundred fifty-five million, four hundred forty-two thousand, two hundred forty".