1397132887 has 2 divisors, whose sum is σ = 1397132888. Its totient is φ = 1397132886.

The previous prime is 1397132881. The next prime is 1397132917. The reversal of 1397132887 is 7882317931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397132887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1397132887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397132881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698566443 + 698566444.

It is an arithmetic number, because the mean of its divisors is an integer number (698566444).

Almost surely, 2^1397132887 is an apocalyptic number.

1397132887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397132887 is an equidigital number, since it uses as much as digits as its factorization.

1397132887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 1397132887 is about 37378.2408227033. The cubic root of 1397132887 is about 1117.9247516940.

The spelling of 1397132887 in words is "one billion, three hundred ninety-seven million, one hundred thirty-two thousand, eight hundred eighty-seven".