399000720 has 40 divisors (see below), whose sum is σ = 1236902976. Its totient is φ = 106400128.

The previous prime is 399000709. The next prime is 399000731. The reversal of 399000720 is 27000993.

It is an interprime number because it is at equal distance from previous prime (399000709) and next prime (399000731).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831012 + ... + 831491.

Almost surely, 2^399000720 is an apocalyptic number.

399000720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399000720 is an abundant number, since it is smaller than the sum of its proper divisors (837902256).

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

399000720 is a wasteful number, since it uses less digits than its factorization.

399000720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662519 (or 1662513 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 399000720 is about 19975.0023779723. The cubic root of 399000720 is about 736.1922249173.

The spelling of 399000720 in words is "three hundred ninety-nine million, seven hundred twenty", and thus it is an aban number.