399424693 has 4 divisors (see below), whose sum is σ = 416791008. Its totient is φ = 382058380.

The previous prime is 399424681. The next prime is 399424699. The reversal of 399424693 is 396424993.

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.

It is a cyclic number.

It is not a de Polignac number, because 399424693 - 2⁵ = 399424661 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 (399424699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8683123 + ... + 8683168.

It is an arithmetic number, because the mean of its divisors is an integer number (104197752).

Almost surely, 2^399424693 is an apocalyptic number.

It is an amenable number.

399424693 is a deficient number, since it is larger than the sum of its proper divisors (17366315).

399424693 is a wasteful number, since it uses less digits than its factorization.

399424693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17366314.

The product of its digits is 1259712, while the sum is 49.

The square root of 399424693 is about 19985.6121497441. The cubic root of 399424693 is about 736.4528887225.

The spelling of 399424693 in words is "three hundred ninety-nine million, four hundred twenty-four thousand, six hundred ninety-three".