1399900657 has 2 divisors, whose sum is σ = 1399900658. Its totient is φ = 1399900656.

The previous prime is 1399900643. The next prime is 1399900699. The reversal of 1399900657 is 7560099931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1320886336 + 79014321 = 36344^2 + 8889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399900657 - 2²³ = 1391512049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1399900657.

It is not a weakly prime, because it can be changed into another prime (1399900627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699950328 + 699950329.

It is an arithmetic number, because the mean of its divisors is an integer number (699950329).

Almost surely, 2^1399900657 is an apocalyptic number.

It is an amenable number.

1399900657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399900657 is an equidigital number, since it uses as much as digits as its factorization.

1399900657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 459270, while the sum is 49.

The square root of 1399900657 is about 37415.2463175107. The cubic root of 1399900657 is about 1118.6624809994.

The spelling of 1399900657 in words is "one billion, three hundred ninety-nine million, nine hundred thousand, six hundred fifty-seven".