399916454 has 16 divisors (see below), whose sum is σ = 685843200. Its totient is φ = 171324744.

The previous prime is 399916393. The next prime is 399916457. The reversal of 399916454 is 454619993.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399916457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49127 + ... + 56685.

It is an arithmetic number, because the mean of its divisors is an integer number (42865200).

Almost surely, 2^399916454 is an apocalyptic number.

399916454 is a deficient number, since it is larger than the sum of its proper divisors (285926746).

399916454 is a wasteful number, since it uses less digits than its factorization.

399916454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11347.

The product of its digits is 1049760, while the sum is 50.

The square root of 399916454 is about 19997.9112409271. The cubic root of 399916454 is about 736.7549984736.

The spelling of 399916454 in words is "three hundred ninety-nine million, nine hundred sixteen thousand, four hundred fifty-four".