399089 has 4 divisors (see below), whose sum is σ = 400356. Its totient is φ = 397824.

The previous prime is 399079. The next prime is 399097. The reversal of 399089 is 980993.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 187489 + 211600 = 433^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 399089 - 2⁸ = 398833 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399059) 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, 257 + ... + 929.

It is an arithmetic number, because the mean of its divisors is an integer number (100089).

2³⁹⁹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

399089 is a deficient number, since it is larger than the sum of its proper divisors (1267).

399089 is an equidigital number, since it uses as much as digits as its factorization.

399089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 399089 is about 631.7349127601. The cubic root of 399089 is about 73.6246515761.

The spelling of 399089 in words is "three hundred ninety-nine thousand, eighty-nine".