155987556 has 24 divisors (see below), whose sum is σ = 364205184. Its totient is φ = 51962400.

The previous prime is 155987551. The next prime is 155987609. The reversal of 155987556 is 655789551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 155987499 and 155987508.

It is not an unprimeable number, because it can be changed into a prime (155987551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21606 + ... + 27906.

It is an arithmetic number, because the mean of its divisors is an integer number (15175216).

Almost surely, 2^155987556 is an apocalyptic number.

It is an amenable number.

155987556 is an abundant number, since it is smaller than the sum of its proper divisors (208217628).

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

155987556 is a wasteful number, since it uses less digits than its factorization.

155987556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8371 (or 8369 counting only the distinct ones).

The product of its digits is 1890000, while the sum is 51.

The square root of 155987556 is about 12489.4978281755. The cubic root of 155987556 is about 538.3069470038.

The spelling of 155987556 in words is "one hundred fifty-five million, nine hundred eighty-seven thousand, five hundred fifty-six".