399766 has 8 divisors (see below), whose sum is σ = 604440. Its totient is φ = 198288.

The previous prime is 399761. The next prime is 399769. The reversal of 399766 is 667993.

399766 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (75555).

2³⁹⁹⁷⁶⁶ is an apocalyptic number.

399766 is a deficient number, since it is larger than the sum of its proper divisors (204674).

399766 is a wasteful number, since it uses less digits than its factorization.

399766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598.

The product of its digits is 61236, while the sum is 40.

The square root of 399766 is about 632.2705117274. The cubic root of 399766 is about 73.6662594473. Note that the first 3 decimals are identical.

The spelling of 399766 in words is "three hundred ninety-nine thousand, seven hundred sixty-six".