1379571397 has 4 divisors (see below), whose sum is σ = 1405601100. Its totient is φ = 1353541696.

The previous prime is 1379571379. The next prime is 1379571419. The reversal of 1379571397 is 7931759731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 951660801 + 427910596 = 30849^2 + 20686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1379571397 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 (1379571337) 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, 13014772 + ... + 13014877.

It is an arithmetic number, because the mean of its divisors is an integer number (351400275).

Almost surely, 2^1379571397 is an apocalyptic number.

It is an amenable number.

1379571397 is a deficient number, since it is larger than the sum of its proper divisors (26029703).

1379571397 is an equidigital number, since it uses as much as digits as its factorization.

1379571397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26029702.

The product of its digits is 1250235, while the sum is 52.

The square root of 1379571397 is about 37142.5819915633. The cubic root of 1379571397 is about 1113.2210088930.

The spelling of 1379571397 in words is "one billion, three hundred seventy-nine million, five hundred seventy-one thousand, three hundred ninety-seven".