1399139389 has 16 divisors (see below), whose sum is σ = 1512725760. Its totient is φ = 1289295360.

The previous prime is 1399139377. The next prime is 1399139431. The reversal of 1399139389 is 9839319931.

It is a cyclic number.

It is not a de Polignac number, because 1399139389 - 2²¹ = 1397042237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399139789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168444 + ... + 176554.

It is an arithmetic number, because the mean of its divisors is an integer number (94545360).

Almost surely, 2^1399139389 is an apocalyptic number.

It is an amenable number.

1399139389 is a deficient number, since it is larger than the sum of its proper divisors (113586371).

1399139389 is a wasteful number, since it uses less digits than its factorization.

1399139389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340.

The product of its digits is 1417176, while the sum is 55.

The square root of 1399139389 is about 37405.0717015754. The cubic root of 1399139389 is about 1118.4596674737.

The spelling of 1399139389 in words is "one billion, three hundred ninety-nine million, one hundred thirty-nine thousand, three hundred eighty-nine".