1399507217 has 2 divisors, whose sum is σ = 1399507218. Its totient is φ = 1399507216.

The previous prime is 1399507181. The next prime is 1399507273. The reversal of 1399507217 is 7127059931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1045164241 + 354342976 = 32329^2 + 18824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399507217 - 2⁸ = 1399506961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1399507117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699753608 + 699753609.

It is an arithmetic number, because the mean of its divisors is an integer number (699753609).

Almost surely, 2^1399507217 is an apocalyptic number.

It is an amenable number.

1399507217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399507217 is an equidigital number, since it uses as much as digits as its factorization.

1399507217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 1399507217 is about 37409.9881983408. The cubic root of 1399507217 is about 1118.5576717038.

The spelling of 1399507217 in words is "one billion, three hundred ninety-nine million, five hundred seven thousand, two hundred seventeen".