6397139377 has 4 divisors (see below), whose sum is σ = 6617730420. Its totient is φ = 6176548336.

The previous prime is 6397139351. The next prime is 6397139381. The reversal of 6397139377 is 7739317936.

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 1199306161 + 5197833216 = 34631^2 + 72096^2 .

It is a cyclic number.

It is not a de Polignac number, because 6397139377 - 2¹⁵ = 6397106609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6397179377) 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, 110295478 + ... + 110295535.

It is an arithmetic number, because the mean of its divisors is an integer number (1654432605).

Almost surely, 2^6397139377 is an apocalyptic number.

It is an amenable number.

6397139377 is a deficient number, since it is larger than the sum of its proper divisors (220591043).

6397139377 is a wasteful number, since it uses less digits than its factorization.

6397139377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220591042.

The product of its digits is 4500846, while the sum is 55.

The square root of 6397139377 is about 79982.1191079606. The cubic root of 6397139377 is about 1856.3588706422.

The spelling of 6397139377 in words is "six billion, three hundred ninety-seven million, one hundred thirty-nine thousand, three hundred seventy-seven".