399404822 has 16 divisors (see below), whose sum is σ = 609647472. Its totient is φ = 196204800.

The previous prime is 399404777. The next prime is 399404843. The reversal of 399404822 is 228404993.

It is a self number, because there is not a number n which added to its sum of digits gives 399404822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50018 + ... + 57450.

It is an arithmetic number, because the mean of its divisors is an integer number (38102967).

Almost surely, 2^399404822 is an apocalyptic number.

399404822 is a deficient number, since it is larger than the sum of its proper divisors (210242650).

399404822 is a wasteful number, since it uses less digits than its factorization.

399404822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7903.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 399404822 is about 19985.1150109275. The cubic root of 399404822 is about 736.4406759088.

The spelling of 399404822 in words is "three hundred ninety-nine million, four hundred four thousand, eight hundred twenty-two".