399490223 has 4 divisors (see below), whose sum is σ = 435807528. Its totient is φ = 363172920.

The previous prime is 399490213. The next prime is 399490229. The reversal of 399490223 is 322094993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322094993 = 11 ⋅29281363.

It is not a de Polignac number, because 399490223 - 2⁴ = 399490207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399490229) 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, 18158636 + ... + 18158657.

It is an arithmetic number, because the mean of its divisors is an integer number (108951882).

Almost surely, 2^399490223 is an apocalyptic number.

399490223 is a deficient number, since it is larger than the sum of its proper divisors (36317305).

399490223 is a wasteful number, since it uses less digits than its factorization.

399490223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36317304.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 399490223 is about 19987.2515119013. The cubic root of 399490223 is about 736.4931609104.

The spelling of 399490223 in words is "three hundred ninety-nine million, four hundred ninety thousand, two hundred twenty-three".