1269604979 has 4 divisors (see below), whose sum is σ = 1269876960. Its totient is φ = 1269333000.

The previous prime is 1269604957. The next prime is 1269604993. The reversal of 1269604979 is 9794069621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1269604979 - 2²⁰ = 1268556403 is a prime.

It is a super-2 number, since 2×1269604979² = 3223793605403180882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1269604979.

It is not an unprimeable number, because it can be changed into a prime (1269604379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128864 + ... + 138365.

It is an arithmetic number, because the mean of its divisors is an integer number (317469240).

Almost surely, 2^1269604979 is an apocalyptic number.

1269604979 is a deficient number, since it is larger than the sum of its proper divisors (271981).

1269604979 is an equidigital number, since it uses as much as digits as its factorization.

1269604979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271980.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 1269604979 is about 35631.5166530980. The cubic root of 1269604979 is about 1082.8198427286.

The spelling of 1269604979 in words is "one billion, two hundred sixty-nine million, six hundred four thousand, nine hundred seventy-nine".