155979769 has 12 divisors (see below), whose sum is σ = 171865792. Its totient is φ = 141455160.

The previous prime is 155979751. The next prime is 155979781. The reversal of 155979769 is 967979551.

It is not a de Polignac number, because 155979769 - 2⁵ = 155979737 is a prime.

It is a super-2 number, since 2×155979769² = 48659376674586722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155979269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57604 + ... + 60250.

Almost surely, 2^155979769 is an apocalyptic number.

It is an amenable number.

155979769 is a deficient number, since it is larger than the sum of its proper divisors (15886023).

155979769 is a wasteful number, since it uses less digits than its factorization.

155979769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156 (or 3145 counting only the distinct ones).

The product of its digits is 5358150, while the sum is 58.

The square root of 155979769 is about 12489.1860823674. The cubic root of 155979769 is about 538.2979893107.

The spelling of 155979769 in words is "one hundred fifty-five million, nine hundred seventy-nine thousand, seven hundred sixty-nine".