155851920 has 360 divisors, whose sum is σ = 641369664. Its totient is φ = 33214464.

The previous prime is 155851907. The next prime is 155851951. The reversal of 155851920 is 29158551.

It is a happy number.

155851920 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1456507 + ... + 1456613.

Almost surely, 2^155851920 is an apocalyptic number.

155851920 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 155851920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320684832).

155851920 is an abundant number, since it is smaller than the sum of its proper divisors (485517744).

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

155851920 is a wasteful number, since it uses less digits than its factorization.

155851920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The square root of 155851920 is about 12484.0666451281. The cubic root of 155851920 is about 538.1508769177.

The spelling of 155851920 in words is "one hundred fifty-five million, eight hundred fifty-one thousand, nine hundred twenty".