1396787725 has 6 divisors (see below), whose sum is σ = 1732016810. Its totient is φ = 1117430160.

The previous prime is 1396787683. The next prime is 1396787773. The reversal of 1396787725 is 5277876931.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 198866404 + 1197921321 = 14102^2 + 34611^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1396787725 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27935730 + ... + 27935779.

Almost surely, 2^1396787725 is an apocalyptic number.

It is an amenable number.

1396787725 is a deficient number, since it is larger than the sum of its proper divisors (335229085).

1396787725 is an equidigital number, since it uses as much as digits as its factorization.

1396787725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55871519 (or 55871514 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 55.

The square root of 1396787725 is about 37373.6233860192. The cubic root of 1396787725 is about 1117.8326829230.

The spelling of 1396787725 in words is "one billion, three hundred ninety-six million, seven hundred eighty-seven thousand, seven hundred twenty-five".