399307764 has 24 divisors (see below), whose sum is σ = 986525568. Its totient is φ = 125272960.

The previous prime is 399307751. The next prime is 399307793. The reversal of 399307764 is 467703993.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 978492 + ... + 978899.

It is an arithmetic number, because the mean of its divisors is an integer number (41105232).

Almost surely, 2^399307764 is an apocalyptic number.

399307764 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

399307764 is an abundant number, since it is smaller than the sum of its proper divisors (587217804).

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

399307764 is a wasteful number, since it uses less digits than its factorization.

399307764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957415 (or 1957413 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 48.

The square root of 399307764 is about 19982.6866061598. The cubic root of 399307764 is about 736.3810177660.

The spelling of 399307764 in words is "three hundred ninety-nine million, three hundred seven thousand, seven hundred sixty-four".