1269985916 has 24 divisors (see below), whose sum is σ = 2347013760. Its totient is φ = 599626800.

The previous prime is 1269985877. The next prime is 1269985933. The reversal of 1269985916 is 6195899621.

It is a super-2 number, since 2×1269985916² = 3225728453676718112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3230 + ... + 50501.

It is an arithmetic number, because the mean of its divisors is an integer number (97792240).

Almost surely, 2^1269985916 is an apocalyptic number.

It is an amenable number.

1269985916 is a deficient number, since it is larger than the sum of its proper divisors (1077027844).

1269985916 is a wasteful number, since it uses less digits than its factorization.

1269985916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54065 (or 54063 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 56.

The square root of 1269985916 is about 35636.8617585780. The cubic root of 1269985916 is about 1082.9281296634.

The spelling of 1269985916 in words is "one billion, two hundred sixty-nine million, nine hundred eighty-five thousand, nine hundred sixteen".