399073 has 4 divisors (see below), whose sum is σ = 416448. Its totient is φ = 381700.

The previous prime is 399071. The next prime is 399079. The reversal of 399073 is 370993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 370993 = 7 ⋅52999.

It is a cyclic number.

It is not a de Polignac number, because 399073 - 2¹ = 399071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399071) 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, 8653 + ... + 8698.

It is an arithmetic number, because the mean of its divisors is an integer number (104112).

2³⁹⁹⁰⁷³ is an apocalyptic number.

It is an amenable number.

399073 is a deficient number, since it is larger than the sum of its proper divisors (17375).

399073 is a wasteful number, since it uses less digits than its factorization.

399073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17374.

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

The square root of 399073 is about 631.7222490937. The cubic root of 399073 is about 73.6236676601.

The spelling of 399073 in words is "three hundred ninety-nine thousand, seventy-three".