399673 has 4 divisors (see below), whose sum is σ = 407268. Its totient is φ = 392080.

The previous prime is 399667. The next prime is 399677. The reversal of 399673 is 376993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157609 + 242064 = 397^2 + 492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399673 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 3718 + ... + 3823.

It is an arithmetic number, because the mean of its divisors is an integer number (101817).

2³⁹⁹⁶⁷³ is an apocalyptic number.

It is an amenable number.

399673 is a deficient number, since it is larger than the sum of its proper divisors (7595).

399673 is an equidigital number, since it uses as much as digits as its factorization.

399673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7594.

The product of its digits is 30618, while the sum is 37.

The square root of 399673 is about 632.1969629791. The cubic root of 399673 is about 73.6605465274.

The spelling of 399673 in words is "three hundred ninety-nine thousand, six hundred seventy-three".