155979936 has 144 divisors (see below), whose sum is σ = 517608000. Its totient is φ = 44537472.

The previous prime is 155979917. The next prime is 155979973. The reversal of 155979936 is 639979551.

155979936 is a `hidden beast` number, since 15 + 597 + 9 + 9 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97995 + ... + 99573.

It is an arithmetic number, because the mean of its divisors is an integer number (3594500).

Almost surely, 2^155979936 is an apocalyptic number.

155979936 is a gapful number since it is divisible by the number (16) 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 155979936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258804000).

155979936 is an abundant number, since it is smaller than the sum of its proper divisors (361628064).

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

155979936 is a wasteful number, since it uses less digits than its factorization.

155979936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616 (or 1591 counting only the distinct ones).

The product of its digits is 2296350, while the sum is 54.

The square root of 155979936 is about 12489.1927681496. The cubic root of 155979936 is about 538.2981814205.

The spelling of 155979936 in words is "one hundred fifty-five million, nine hundred seventy-nine thousand, nine hundred thirty-six".