399712 has 12 divisors (see below), whose sum is σ = 786996. Its totient is φ = 199840.

The previous prime is 399691. The next prime is 399719. The reversal of 399712 is 217993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399719) by changing a digit.

399712 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6214 + ... + 6277.

It is an arithmetic number, because the mean of its divisors is an integer number (65583).

2³⁹⁹⁷¹² is an apocalyptic number.

399712 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

399712 is a deficient number, since it is larger than the sum of its proper divisors (387284).

399712 is a wasteful number, since it uses less digits than its factorization.

399712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12501 (or 12493 counting only the distinct ones).

The product of its digits is 3402, while the sum is 31.

The square root of 399712 is about 632.2278070443. The cubic root of 399712 is about 73.6629423759.

It can be divided in two parts, 399 and 712, that added together give a palindrome (1111).

The spelling of 399712 in words is "three hundred ninety-nine thousand, seven hundred twelve".