1397988677 has 2 divisors, whose sum is σ = 1397988678. Its totient is φ = 1397988676.

The previous prime is 1397988643. The next prime is 1397988733. The reversal of 1397988677 is 7768897931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 699390916 + 698597761 = 26446^2 + 26431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397988677 - 2²² = 1393794373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397988637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698994338 + 698994339.

It is an arithmetic number, because the mean of its divisors is an integer number (698994339).

Almost surely, 2^1397988677 is an apocalyptic number.

It is an amenable number.

1397988677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397988677 is an equidigital number, since it uses as much as digits as its factorization.

1397988677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 65.

The square root of 1397988677 is about 37389.6867732267. The cubic root of 1397988677 is about 1118.1529603729.

The spelling of 1397988677 in words is "one billion, three hundred ninety-seven million, nine hundred eighty-eight thousand, six hundred seventy-seven".