1399139651 has 32 divisors (see below), whose sum is σ = 1825152000. Its totient is φ = 1041517440.

The previous prime is 1399139641. The next prime is 1399139653. The reversal of 1399139651 is 1569319931.

It is a cyclic number.

It is not a de Polignac number, because 1399139651 - 2³⁰ = 325397827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1399139596 and 1399139605.

It is not an unprimeable number, because it can be changed into a prime (1399139653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254906 + ... + 260336.

It is an arithmetic number, because the mean of its divisors is an integer number (57036000).

Almost surely, 2^1399139651 is an apocalyptic number.

1399139651 is a deficient number, since it is larger than the sum of its proper divisors (426012349).

1399139651 is a wasteful number, since it uses less digits than its factorization.

1399139651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5619.

The product of its digits is 196830, while the sum is 47.

The square root of 1399139651 is about 37405.0752037742. The cubic root of 1399139651 is about 1118.4597372872.

The spelling of 1399139651 in words is "one billion, three hundred ninety-nine million, one hundred thirty-nine thousand, six hundred fifty-one".