1397908239 has 32 divisors (see below), whose sum is σ = 2323077120. Its totient is φ = 728013312.

The previous prime is 1397908219. The next prime is 1397908247. The reversal of 1397908239 is 9328097931.

It is a happy number.

It is not a de Polignac number, because 1397908239 - 2⁷ = 1397908111 is a prime.

It is a super-2 number, since 2×1397908239² = 3908294889328162242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1397908191 and 1397908200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397908219) 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, 10842 + ... + 53975.

It is an arithmetic number, because the mean of its divisors is an integer number (72596160).

Almost surely, 2^1397908239 is an apocalyptic number.

1397908239 is a deficient number, since it is larger than the sum of its proper divisors (925168881).

1397908239 is a wasteful number, since it uses less digits than its factorization.

1397908239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64919.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 1397908239 is about 37388.6110868002. The cubic root of 1397908239 is about 1118.1315143926.

The spelling of 1397908239 in words is "one billion, three hundred ninety-seven million, nine hundred eight thousand, two hundred thirty-nine".