399291814 has 8 divisors (see below), whose sum is σ = 601978608. Its totient is φ = 198632280.

The previous prime is 399291769. The next prime is 399291829. The reversal of 399291814 is 418192993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506322 + ... + 507109.

It is an arithmetic number, because the mean of its divisors is an integer number (75247326).

Almost surely, 2^399291814 is an apocalyptic number.

399291814 is a deficient number, since it is larger than the sum of its proper divisors (202686794).

399291814 is a wasteful number, since it uses less digits than its factorization.

399291814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013630.

The product of its digits is 139968, while the sum is 46.

The square root of 399291814 is about 19982.2875066895. The cubic root of 399291814 is about 736.3712129365.

The spelling of 399291814 in words is "three hundred ninety-nine million, two hundred ninety-one thousand, eight hundred fourteen".