399976814 has 12 divisors (see below), whose sum is σ = 603292704. Its totient is φ = 198881364.

The previous prime is 399976813. The next prime is 399976879. The reversal of 399976814 is 418679993.

It is a self number, because there is not a number n which added to its sum of digits gives 399976814.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399976813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 421889 + ... + 422835.

It is an arithmetic number, because the mean of its divisors is an integer number (50274392).

Almost surely, 2^399976814 is an apocalyptic number.

399976814 is a deficient number, since it is larger than the sum of its proper divisors (203315890).

399976814 is an frugal number, since it uses more digits than its factorization.

399976814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119 (or 1172 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 56.

The square root of 399976814 is about 19999.4203415999. The cubic root of 399976814 is about 736.7920631273.

The spelling of 399976814 in words is "three hundred ninety-nine million, nine hundred seventy-six thousand, eight hundred fourteen".