397149279 has 4 divisors (see below), whose sum is σ = 529532376. Its totient is φ = 264766184.

The previous prime is 397149253. The next prime is 397149283. The reversal of 397149279 is 972941793.

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

It is a cyclic number.

It is not a de Polignac number, because 397149279 - 2⁸ = 397149023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397149209) 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, 66191544 + ... + 66191549.

It is an arithmetic number, because the mean of its divisors is an integer number (132383094).

Almost surely, 2^397149279 is an apocalyptic number.

397149279 is a deficient number, since it is larger than the sum of its proper divisors (132383097).

397149279 is a wasteful number, since it uses less digits than its factorization.

397149279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132383096.

The product of its digits is 857304, while the sum is 51.

The square root of 397149279 is about 19928.6045422152. The cubic root of 397149279 is about 735.0517673752.

The spelling of 397149279 in words is "three hundred ninety-seven million, one hundred forty-nine thousand, two hundred seventy-nine".