399117 has 4 divisors (see below), whose sum is σ = 532160. Its totient is φ = 266076.

The previous prime is 399107. The next prime is 399131. The reversal of 399117 is 711993.

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: 711993 = 3 ⋅237331.

It is not a de Polignac number, because 399117 - 2⁴ = 399101 is a prime.

It is a D-number.

It is a Duffinian number.

399117 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 399117.

It is not an unprimeable number, because it can be changed into a prime (399107) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66517 + ... + 66522.

It is an arithmetic number, because the mean of its divisors is an integer number (133040).

2³⁹⁹¹¹⁷ is an apocalyptic number.

It is an amenable number.

399117 is a deficient number, since it is larger than the sum of its proper divisors (133043).

399117 is a wasteful number, since it uses less digits than its factorization.

399117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133042.

The product of its digits is 1701, while the sum is 30.

The square root of 399117 is about 631.7570735655. The cubic root of 399117 is about 73.6263733658.

The spelling of 399117 in words is "three hundred ninety-nine thousand, one hundred seventeen".