399366464 has 84 divisors (see below), whose sum is σ = 927055296. Its totient is φ = 170198784.

The previous prime is 399366439. The next prime is 399366481. The reversal of 399366464 is 464663993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1088009 + ... + 1088375.

Almost surely, 2^399366464 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 399366464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (463527648).

399366464 is an abundant number, since it is smaller than the sum of its proper divisors (527688832).

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

399366464 is a wasteful number, since it uses less digits than its factorization.

399366464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 723 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 50.

The square root of 399366464 is about 19984.1553236558. The cubic root of 399366464 is about 736.4170997489.

The spelling of 399366464 in words is "three hundred ninety-nine million, three hundred sixty-six thousand, four hundred sixty-four".