399663264 has 192 divisors, whose sum is σ = 1408942080. Its totient is φ = 95800320.

The previous prime is 399663263. The next prime is 399663281. The reversal of 399663264 is 462366993.

It is a super-2 number, since 2×399663264² = 319461449182267392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (399663263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94017 + ... + 98175.

It is an arithmetic number, because the mean of its divisors is an integer number (7338240).

Almost surely, 2^399663264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399663264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704471040).

399663264 is an abundant number, since it is smaller than the sum of its proper divisors (1009278816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399663264 is a wasteful number, since it uses less digits than its factorization.

399663264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203 (or 4195 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 48.

The square root of 399663264 is about 19991.5798275174. The cubic root of 399663264 is about 736.5994840102.

The spelling of 399663264 in words is "three hundred ninety-nine million, six hundred sixty-three thousand, two hundred sixty-four".