155399040 has 384 divisors, whose sum is σ = 609184800. Its totient is φ = 37306368.

The previous prime is 155399009. The next prime is 155399051. The reversal of 155399040 is 40993551.

It is a tau number, because it is divible by the number of its divisors (384).

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

It is a junction number, because it is equal to n+sod(n) for n = 155398986 and 155399004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6756469 + ... + 6756491.

Almost surely, 2^155399040 is an apocalyptic number.

155399040 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 155399040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304592400).

155399040 is an abundant number, since it is smaller than the sum of its proper divisors (453785760).

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

155399040 is a wasteful number, since it uses less digits than its factorization.

155399040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 155399040 is about 12465.9151288624. The cubic root of 155399040 is about 537.6291119439.

The spelling of 155399040 in words is "one hundred fifty-five million, three hundred ninety-nine thousand, forty".