399790 has 8 divisors (see below), whose sum is σ = 719640. Its totient is φ = 159912.

The previous prime is 399787. The next prime is 399793. The reversal of 399790 is 97993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399787) and next prime (399793).

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 (399793) 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, 19980 + ... + 19999.

It is an arithmetic number, because the mean of its divisors is an integer number (89955).

2³⁹⁹⁷⁹⁰ is an apocalyptic number.

399790 is a deficient number, since it is larger than the sum of its proper divisors (319850).

399790 is a wasteful number, since it uses less digits than its factorization.

399790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39986.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 399790 is about 632.2894906607. The cubic root of 399790 is about 73.6677336054.

The spelling of 399790 in words is "three hundred ninety-nine thousand, seven hundred ninety".