399756 has 24 divisors (see below), whose sum is σ = 1066240. Its totient is φ = 114192.

The previous prime is 399739. The next prime is 399757. The reversal of 399756 is 657993.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (399757) by changing a digit.

399756 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2296 + ... + 2463.

2³⁹⁹⁷⁵⁶ is an apocalyptic number.

It is an amenable number.

399756 is an abundant number, since it is smaller than the sum of its proper divisors (666484).

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

399756 is a wasteful number, since it uses less digits than its factorization.

399756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773 (or 4771 counting only the distinct ones).

The product of its digits is 51030, while the sum is 39.

The square root of 399756 is about 632.2626036703. The cubic root of 399756 is about 73.6656451974.

The spelling of 399756 in words is "three hundred ninety-nine thousand, seven hundred fifty-six".