399682673 has 4 divisors (see below), whose sum is σ = 430427508. Its totient is φ = 368937840.

The previous prime is 399682667. The next prime is 399682687. The reversal of 399682673 is 376286993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 376286993 = 17 ⋅22134529.

It can be written as a sum of positive squares in 2 ways, for example, as 121727089 + 277955584 = 11033^2 + 16672^2 .

It is a cyclic number.

It is not a de Polignac number, because 399682673 - 2¹⁸ = 399420529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399682663) 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, 15372398 + ... + 15372423.

It is an arithmetic number, because the mean of its divisors is an integer number (107606877).

Almost surely, 2^399682673 is an apocalyptic number.

It is an amenable number.

399682673 is a deficient number, since it is larger than the sum of its proper divisors (30744835).

399682673 is a wasteful number, since it uses less digits than its factorization.

399682673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30744834.

The product of its digits is 2939328, while the sum is 53.

The square root of 399682673 is about 19992.0652509940. The cubic root of 399682673 is about 736.6114077380.

The spelling of 399682673 in words is "three hundred ninety-nine million, six hundred eighty-two thousand, six hundred seventy-three".