1269940979 has 4 divisors (see below), whose sum is σ = 1277545584. Its totient is φ = 1262336376.

The previous prime is 1269940921. The next prime is 1269940993. The reversal of 1269940979 is 9790499621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9790499621 = 7 ⋅1398642803.

It is a cyclic number.

It is not a de Polignac number, because 1269940979 - 2⁸ = 1269940723 is a prime.

It is a super-2 number, since 2×1269940979² = 3225500180286956882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1269940379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3802052 + ... + 3802385.

It is an arithmetic number, because the mean of its divisors is an integer number (319386396).

Almost surely, 2^1269940979 is an apocalyptic number.

1269940979 is a deficient number, since it is larger than the sum of its proper divisors (7604605).

1269940979 is an equidigital number, since it uses as much as digits as its factorization.

1269940979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7604604.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The square root of 1269940979 is about 35636.2312681911. The cubic root of 1269940979 is about 1082.9153567880.

The spelling of 1269940979 in words is "one billion, two hundred sixty-nine million, nine hundred forty thousand, nine hundred seventy-nine".