155844240 has 80 divisors (see below), whose sum is σ = 487016448. Its totient is φ = 41223168.

The previous prime is 155844229. The next prime is 155844257. The reversal of 155844240 is 42448551.

It is a happy number.

155844240 is digitally balanced in base 2, 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 (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27924 + ... + 33036.

Almost surely, 2^155844240 is an apocalyptic number.

155844240 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 155844240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243508224).

155844240 is an abundant number, since it is smaller than the sum of its proper divisors (331172208).

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

155844240 is a wasteful number, since it uses less digits than its factorization.

155844240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5256 (or 5250 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 33.

The square root of 155844240 is about 12483.7590492608. The cubic root of 155844240 is about 538.1420371878.

The spelling of 155844240 in words is "one hundred fifty-five million, eight hundred forty-four thousand, two hundred forty".