1397400487 has 18 divisors (see below), whose sum is σ = 1628020104. Its totient is φ = 1174967640.

The previous prime is 1397400479. The next prime is 1397400509. The reversal of 1397400487 is 7840047931.

It is not a de Polignac number, because 1397400487 - 2³ = 1397400479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397400457) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7022014 + ... + 7022212.

Almost surely, 2^1397400487 is an apocalyptic number.

1397400487 is a deficient number, since it is larger than the sum of its proper divisors (230619617).

1397400487 is an frugal number, since it uses more digits than its factorization.

1397400487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 1397400487 is about 37381.8202740316. The cubic root of 1397400487 is about 1117.9961210840.

The spelling of 1397400487 in words is "one billion, three hundred ninety-seven million, four hundred thousand, four hundred eighty-seven".