155990232 has 128 divisors (see below), whose sum is σ = 479001600. Its totient is φ = 46785024.

The previous prime is 155990221. The next prime is 155990243. The reversal of 155990232 is 232099551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155990221) and next prime (155990243).

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 31 ways as a sum of consecutive naturals, for example, 83533 + ... + 85379.

It is an arithmetic number, because the mean of its divisors is an integer number (3742200).

Almost surely, 2^155990232 is an apocalyptic number.

155990232 is a gapful number since it is divisible by the number (12) 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 155990232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239500800).

155990232 is an abundant number, since it is smaller than the sum of its proper divisors (323011368).

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

155990232 is a wasteful number, since it uses less digits than its factorization.

155990232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902 (or 1892 counting only the distinct ones).

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

The square root of 155990232 is about 12489.6049577238. The cubic root of 155990232 is about 538.3100252433.

The spelling of 155990232 in words is "one hundred fifty-five million, nine hundred ninety thousand, two hundred thirty-two".