399293 has 4 divisors (see below), whose sum is σ = 401280. Its totient is φ = 397308.

The previous prime is 399283. The next prime is 399353. The reversal of 399293 is 392993.

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: 392993 = 163 ⋅2411.

It is a cyclic number.

It is not a de Polignac number, because 399293 - 2⁴ = 399277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399263) 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, 653 + ... + 1106.

It is an arithmetic number, because the mean of its divisors is an integer number (100320).

2³⁹⁹²⁹³ is an apocalyptic number.

It is an amenable number.

399293 is a deficient number, since it is larger than the sum of its proper divisors (1987).

399293 is a wasteful number, since it uses less digits than its factorization.

399293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986.

The product of its digits is 13122, while the sum is 35.

The square root of 399293 is about 631.8963522604. The cubic root of 399293 is about 73.6371942007.

The spelling of 399293 in words is "three hundred ninety-nine thousand, two hundred ninety-three".