399269 has 4 divisors (see below), whose sum is σ = 429996. Its totient is φ = 368544.

The previous prime is 399263. The next prime is 399271. The reversal of 399269 is 962993.

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 214369 + 184900 = 463^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 399269 - 2¹² = 395173 is a prime.

It is a super-2 number, since 2×399269² = 318831468722, 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 (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, 15344 + ... + 15369.

It is an arithmetic number, because the mean of its divisors is an integer number (107499).

2³⁹⁹²⁶⁹ is an apocalyptic number.

It is an amenable number.

399269 is a deficient number, since it is larger than the sum of its proper divisors (30727).

399269 is a wasteful number, since it uses less digits than its factorization.

399269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30726.

The product of its digits is 26244, while the sum is 38.

The square root of 399269 is about 631.8773615188. The cubic root of 399269 is about 73.6357188196.

The spelling of 399269 in words is "three hundred ninety-nine thousand, two hundred sixty-nine".