1289675639 has 12 divisors (see below), whose sum is σ = 1501363584. Its totient is φ = 1104604704.

The previous prime is 1289675627. The next prime is 1289675657. The reversal of 1289675639 is 9365769821.

It is a happy number.

It is not a de Polignac number, because 1289675639 - 2²⁸ = 1021240183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289675689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61034 + ... + 79400.

It is an arithmetic number, because the mean of its divisors is an integer number (125113632).

Almost surely, 2^1289675639 is an apocalyptic number.

1289675639 is a deficient number, since it is larger than the sum of its proper divisors (211687945).

1289675639 is a wasteful number, since it uses less digits than its factorization.

1289675639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19814 (or 19807 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 56.

The square root of 1289675639 is about 35912.0542297430. The cubic root of 1289675639 is about 1088.4959867237.

The spelling of 1289675639 in words is "one billion, two hundred eighty-nine million, six hundred seventy-five thousand, six hundred thirty-nine".