155408240 has 160 divisors (see below), whose sum is σ = 416223360. Its totient is φ = 53526528.

The previous prime is 155408233. The next prime is 155408261. The reversal of 155408240 is 42804551.

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, 1746116 + ... + 1746204.

It is an arithmetic number, because the mean of its divisors is an integer number (2601396).

Almost surely, 2^155408240 is an apocalyptic number.

155408240 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 155408240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208111680).

155408240 is an abundant number, since it is smaller than the sum of its proper divisors (260815120).

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

155408240 is a wasteful number, since it uses less digits than its factorization.

155408240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 155408240 is about 12466.2841296033. The cubic root of 155408240 is about 537.6397213836.

The spelling of 155408240 in words is "one hundred fifty-five million, four hundred eight thousand, two hundred forty".