155918840 has 256 divisors, whose sum is σ = 477757440. Its totient is φ = 44352000.

The previous prime is 155918831. The next prime is 155918843. The reversal of 155918840 is 48819551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155918843) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2196005 + ... + 2196075.

It is an arithmetic number, because the mean of its divisors is an integer number (1866240).

Almost surely, 2^155918840 is an apocalyptic number.

155918840 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 155918840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238878720).

155918840 is an abundant number, since it is smaller than the sum of its proper divisors (321838600).

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

155918840 is a wasteful number, since it uses less digits than its factorization.

155918840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 41.

The square root of 155918840 is about 12486.7465738678. The cubic root of 155918840 is about 538.2278899856.

The spelling of 155918840 in words is "one hundred fifty-five million, nine hundred eighteen thousand, eight hundred forty".