399289694 has 4 divisors (see below), whose sum is σ = 598934544. Its totient is φ = 199644846.

The previous prime is 399289691. The next prime is 399289739. The reversal of 399289694 is 496982993.

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

It is a super-2 number, since 2×399289694² = 318864519469227272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399289691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99822422 + ... + 99822425.

It is an arithmetic number, because the mean of its divisors is an integer number (149733636).

Almost surely, 2^399289694 is an apocalyptic number.

399289694 is a deficient number, since it is larger than the sum of its proper divisors (199644850).

399289694 is a wasteful number, since it uses less digits than its factorization.

399289694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199644849.

The product of its digits is 7558272, while the sum is 59.

The square root of 399289694 is about 19982.2344596394. The cubic root of 399289694 is about 736.3699097044.

The spelling of 399289694 in words is "three hundred ninety-nine million, two hundred eighty-nine thousand, six hundred ninety-four".