1399390557 has 16 divisors (see below), whose sum is σ = 1912525440. Its totient is φ = 909619200.

The previous prime is 1399390529. The next prime is 1399390583. The reversal of 1399390557 is 7550939931.

It is not a de Polignac number, because 1399390557 - 2⁶ = 1399390493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399310557) 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, 328632 + ... + 332862.

It is an arithmetic number, because the mean of its divisors is an integer number (119532840).

Almost surely, 2^1399390557 is an apocalyptic number.

It is an amenable number.

1399390557 is a deficient number, since it is larger than the sum of its proper divisors (513134883).

1399390557 is a wasteful number, since it uses less digits than its factorization.

1399390557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6964.

The product of its (nonzero) digits is 1148175, while the sum is 51.

The square root of 1399390557 is about 37408.4289565868. The cubic root of 1399390557 is about 1118.5265906294.

The spelling of 1399390557 in words is "one billion, three hundred ninety-nine million, three hundred ninety thousand, five hundred fifty-seven".