155986992 has 120 divisors (see below), whose sum is σ = 520911600. Its totient is φ = 44561664.

The previous prime is 155986991. The next prime is 155987021. The reversal of 155986992 is 299689551.

155986992 is a `hidden beast` number, since 1 + 559 + 86 + 9 + 9 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (155986991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17484 + ... + 24852.

It is an arithmetic number, because the mean of its divisors is an integer number (4340930).

Almost surely, 2^155986992 is an apocalyptic number.

155986992 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 155986992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260455800).

155986992 is an abundant number, since it is smaller than the sum of its proper divisors (364924608).

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

155986992 is a wasteful number, since it uses less digits than its factorization.

155986992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7400 (or 7381 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The square root of 155986992 is about 12489.4752491848. The cubic root of 155986992 is about 538.3062982224.

The spelling of 155986992 in words is "one hundred fifty-five million, nine hundred eighty-six thousand, nine hundred ninety-two".