1289863939 has 12 divisors (see below), whose sum is σ = 1596248976. Its totient is φ = 1020550752.

The previous prime is 1289863891. The next prime is 1289863951. The reversal of 1289863939 is 9393689821.

It is not a de Polignac number, because 1289863939 - 2²⁷ = 1155646211 is a prime.

It is a super-2 number, since 2×1289863939² = 3327497962265191442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1289863039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 543984 + ... + 546349.

It is an arithmetic number, because the mean of its divisors is an integer number (133020748).

Almost surely, 2^1289863939 is an apocalyptic number.

1289863939 is a deficient number, since it is larger than the sum of its proper divisors (306385037).

1289863939 is a wasteful number, since it uses less digits than its factorization.

1289863939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090366 (or 1090353 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 58.

The square root of 1289863939 is about 35914.6758164403. The cubic root of 1289863939 is about 1088.5489596867.

The spelling of 1289863939 in words is "one billion, two hundred eighty-nine million, eight hundred sixty-three thousand, nine hundred thirty-nine".