1269978065 has 16 divisors (see below), whose sum is σ = 1551021696. Its totient is φ = 998054400.

The previous prime is 1269978049. The next prime is 1269978067. The reversal of 1269978065 is 5608799621.

It is not a de Polignac number, because 1269978065 - 2⁴ = 1269978049 is a prime.

It is a super-2 number, since 2×1269978065² = 3225688571162288450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1269977998 and 1269978016.

It is not an unprimeable number, because it can be changed into a prime (1269978067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94145 + ... + 106785.

It is an arithmetic number, because the mean of its divisors is an integer number (96938856).

Almost surely, 2^1269978065 is an apocalyptic number.

It is an amenable number.

1269978065 is a deficient number, since it is larger than the sum of its proper divisors (281043631).

1269978065 is a wasteful number, since it uses less digits than its factorization.

1269978065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13000.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 1269978065 is about 35636.7516056107. The cubic root of 1269978065 is about 1082.9258981199.

The spelling of 1269978065 in words is "one billion, two hundred sixty-nine million, nine hundred seventy-eight thousand, sixty-five".