1397840907 has 16 divisors (see below), whose sum is σ = 1892834720. Its totient is φ = 917471232.

The previous prime is 1397840897. The next prime is 1397840957. The reversal of 1397840907 is 7090487931.

It is not a de Polignac number, because 1397840907 - 2⁴ = 1397840891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1397840957) 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, 43719 + ... + 68607.

It is an arithmetic number, because the mean of its divisors is an integer number (118302170).

Almost surely, 2^1397840907 is an apocalyptic number.

1397840907 is a deficient number, since it is larger than the sum of its proper divisors (494993813).

1397840907 is a wasteful number, since it uses less digits than its factorization.

1397840907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25182.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 1397840907 is about 37387.7106413324. The cubic root of 1397840907 is about 1118.1135620364.

The spelling of 1397840907 in words is "one billion, three hundred ninety-seven million, eight hundred forty thousand, nine hundred seven".