399279473 has 4 divisors (see below), whose sum is σ = 412159488. Its totient is φ = 386399460.

The previous prime is 399279427. The next prime is 399279479. The reversal of 399279473 is 374972993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 374972993 = 31 ⋅12095903.

It is a cyclic number.

It is not a de Polignac number, because 399279473 - 2⁶ = 399279409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399279479) 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, 6439961 + ... + 6440022.

It is an arithmetic number, because the mean of its divisors is an integer number (103039872).

Almost surely, 2^399279473 is an apocalyptic number.

It is an amenable number.

399279473 is a deficient number, since it is larger than the sum of its proper divisors (12880015).

399279473 is a wasteful number, since it uses less digits than its factorization.

399279473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12880014.

The product of its digits is 2571912, while the sum is 53.

The square root of 399279473 is about 19981.9787058239. The cubic root of 399279473 is about 736.3636264626.

The spelling of 399279473 in words is "three hundred ninety-nine million, two hundred seventy-nine thousand, four hundred seventy-three".