397136279 has 4 divisors (see below), whose sum is σ = 402576576. Its totient is φ = 391695984.

The previous prime is 397136249. The next prime is 397136317. The reversal of 397136279 is 972631793.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397136279 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 (397136219) 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, 2720039 + ... + 2720184.

It is an arithmetic number, because the mean of its divisors is an integer number (100644144).

Almost surely, 2^397136279 is an apocalyptic number.

397136279 is a deficient number, since it is larger than the sum of its proper divisors (5440297).

397136279 is an equidigital number, since it uses as much as digits as its factorization.

397136279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440296.

The product of its digits is 428652, while the sum is 47.

The square root of 397136279 is about 19928.2783752134. The cubic root of 397136279 is about 735.0437470683.

The spelling of 397136279 in words is "three hundred ninety-seven million, one hundred thirty-six thousand, two hundred seventy-nine".