399319 has 4 divisors (see below), whose sum is σ = 401544. Its totient is φ = 397096.

The previous prime is 399283. The next prime is 399353. The reversal of 399319 is 913993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 913993 = 29 ⋅31517.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399319 is a prime.

It is a super-2 number, since 2×399319² = 318911327522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399379) 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, 817 + ... + 1210.

It is an arithmetic number, because the mean of its divisors is an integer number (100386).

2³⁹⁹³¹⁹ is an apocalyptic number.

399319 is a deficient number, since it is larger than the sum of its proper divisors (2225).

399319 is a wasteful number, since it uses less digits than its factorization.

399319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224.

The product of its digits is 6561, while the sum is 34.

The square root of 399319 is about 631.9169249197. The cubic root of 399319 is about 73.6387924635.

The spelling of 399319 in words is "three hundred ninety-nine thousand, three hundred nineteen".