1397925197 has 4 divisors (see below), whose sum is σ = 1398009756. Its totient is φ = 1397840640.

The previous prime is 1397925187. The next prime is 1397925223. The reversal of 1397925197 is 7915297931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1311453796 + 86471401 = 36214^2 + 9299^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397925197 - 2¹⁰ = 1397924173 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 (1397925127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8468 + ... + 53549.

It is an arithmetic number, because the mean of its divisors is an integer number (349502439).

Almost surely, 2^1397925197 is an apocalyptic number.

It is an amenable number.

1397925197 is a deficient number, since it is larger than the sum of its proper divisors (84559).

1397925197 is an equidigital number, since it uses as much as digits as its factorization.

1397925197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84558.

The product of its digits is 1071630, while the sum is 53.

The square root of 1397925197 is about 37388.8378664007. The cubic root of 1397925197 is about 1118.1360357188.

The spelling of 1397925197 in words is "one billion, three hundred ninety-seven million, nine hundred twenty-five thousand, one hundred ninety-seven".