399451464 has 48 divisors (see below), whose sum is σ = 1088135100. Its totient is φ = 132376704.

The previous prime is 399451463. The next prime is 399451469. The reversal of 399451464 is 464154993.

It can be written as a sum of positive squares in 2 ways, for example, as 333354564 + 66096900 = 18258^2 + 8130^2 .

It is a super-2 number, since 2×399451464² = 319122944183486592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399451463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3579 + ... + 28490.

Almost surely, 2^399451464 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 399451464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (544067550).

399451464 is an abundant number, since it is smaller than the sum of its proper divisors (688683636).

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

399451464 is a wasteful number, since it uses less digits than its factorization.

399451464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32254 (or 32247 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 399451464 is about 19986.2818953401. The cubic root of 399451464 is about 736.4693416694.

The spelling of 399451464 in words is "three hundred ninety-nine million, four hundred fifty-one thousand, four hundred sixty-four".