155383920 has 120 divisors (see below), whose sum is σ = 541225776. Its totient is φ = 41430528.

The previous prime is 155383909. The next prime is 155383933. The reversal of 155383920 is 29383551.

155383920 is a `hidden beast` number, since 1 + 553 + 83 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15444 + ... + 23436.

Almost surely, 2^155383920 is an apocalyptic number.

155383920 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 155383920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270612888).

155383920 is an abundant number, since it is smaller than the sum of its proper divisors (385841856).

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

155383920 is an equidigital number, since it uses as much as digits as its factorization.

155383920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8021 (or 8003 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 155383920 is about 12465.3086604384. The cubic root of 155383920 is about 537.6116746508.

The spelling of 155383920 in words is "one hundred fifty-five million, three hundred eighty-three thousand, nine hundred twenty".