1397192661 has 24 divisors (see below), whose sum is σ = 2173856256. Its totient is φ = 862218720.

The previous prime is 1397192647. The next prime is 1397192663. The reversal of 1397192661 is 1662917931.

It is not a de Polignac number, because 1397192661 - 2¹⁰ = 1397191637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397192663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102450 + ... + 115283.

It is an arithmetic number, because the mean of its divisors is an integer number (90577344).

Almost surely, 2^1397192661 is an apocalyptic number.

It is an amenable number.

1397192661 is a deficient number, since it is larger than the sum of its proper divisors (776663595).

1397192661 is a wasteful number, since it uses less digits than its factorization.

1397192661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217793 (or 217790 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 1397192661 is about 37379.0403969925. The cubic root of 1397192661 is about 1117.9406943152.

The spelling of 1397192661 in words is "one billion, three hundred ninety-seven million, one hundred ninety-two thousand, six hundred sixty-one".