399261323 has 4 divisors (see below), whose sum is σ = 400412280. Its totient is φ = 398110368.

The previous prime is 399261293. The next prime is 399261341. The reversal of 399261323 is 323162993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399261323 - 2⁶ = 399261259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399261353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574958 + ... + 575651.

It is an arithmetic number, because the mean of its divisors is an integer number (100103070).

Almost surely, 2^399261323 is an apocalyptic number.

399261323 is a deficient number, since it is larger than the sum of its proper divisors (1150957).

399261323 is a wasteful number, since it uses less digits than its factorization.

399261323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150956.

The product of its digits is 52488, while the sum is 38.

The square root of 399261323 is about 19981.5245414358. The cubic root of 399261323 is about 736.3524686953.

The spelling of 399261323 in words is "three hundred ninety-nine million, two hundred sixty-one thousand, three hundred twenty-three".