1389257684 has 36 divisors (see below), whose sum is σ = 2623608960. Its totient is φ = 642964080.

The previous prime is 1389257659. The next prime is 1389257687. The reversal of 1389257684 is 4867529831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389257687) 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, 55007 + ... + 76185.

Almost surely, 2^1389257684 is an apocalyptic number.

It is an amenable number.

1389257684 is a deficient number, since it is larger than the sum of its proper divisors (1234351276).

1389257684 is a wasteful number, since it uses less digits than its factorization.

1389257684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21260 (or 21235 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The square root of 1389257684 is about 37272.7472022120. The cubic root of 1389257684 is about 1115.8203281705.

The spelling of 1389257684 in words is "one billion, three hundred eighty-nine million, two hundred fifty-seven thousand, six hundred eighty-four".