399670 has 16 divisors (see below), whose sum is σ = 762048. Its totient is φ = 150400.

The previous prime is 399667. The next prime is 399677. The reversal of 399670 is 76993.

It is a super-2 number, since 2×399670² = 319472217800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006 + ... + 1345.

It is an arithmetic number, because the mean of its divisors is an integer number (47628).

2³⁹⁹⁶⁷⁰ is an apocalyptic number.

399670 is a deficient number, since it is larger than the sum of its proper divisors (362378).

399670 is a wasteful number, since it uses less digits than its factorization.

399670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 399670 is about 632.1945902964. The cubic root of 399670 is about 73.6603622249.

The spelling of 399670 in words is "three hundred ninety-nine thousand, six hundred seventy".