399069 has 24 divisors (see below), whose sum is σ = 655200. Its totient is φ = 231840.

The previous prime is 399067. The next prime is 399071. The reversal of 399069 is 960993.

It is an interprime number because it is at equal distance from previous prime (399067) and next prime (399071).

It is not a de Polignac number, because 399069 - 2¹ = 399067 is a prime.

It is a super-2 number, since 2×399069² = 318512133522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2802 + ... + 2940.

It is an arithmetic number, because the mean of its divisors is an integer number (27300).

2³⁹⁹⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

399069 is a deficient number, since it is larger than the sum of its proper divisors (256131).

399069 is a wasteful number, since it uses less digits than its factorization.

399069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 399069 is about 631.7190831374. The cubic root of 399069 is about 73.6234216770.

The spelling of 399069 in words is "three hundred ninety-nine thousand, sixty-nine".