399730 has 16 divisors (see below), whose sum is σ = 730944. Its totient is φ = 157360.

The previous prime is 399727. The next prime is 399731. The reversal of 399730 is 37993.

It is a junction number, because it is equal to n+sod(n) for n = 399692 and 399701.

It is not an unprimeable number, because it can be changed into a prime (399731) 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, 429 + ... + 991.

It is an arithmetic number, because the mean of its divisors is an integer number (45684).

2³⁹⁹⁷³⁰ is an apocalyptic number.

399730 is a deficient number, since it is larger than the sum of its proper divisors (331214).

399730 is a wasteful number, since it uses less digits than its factorization.

399730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641.

The product of its (nonzero) digits is 5103, while the sum is 31.

The square root of 399730 is about 632.2420422591. The cubic root of 399730 is about 73.6640480996.

The spelling of 399730 in words is "three hundred ninety-nine thousand, seven hundred thirty".