399919319 has 4 divisors (see below), whose sum is σ = 402129000. Its totient is φ = 397709640.

The previous prime is 399919301. The next prime is 399919321. The reversal of 399919319 is 913919993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399919319 is a prime.

It is a super-2 number, since 2×399919319² = 319870923418847522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399979319) 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, 1104569 + ... + 1104930.

It is an arithmetic number, because the mean of its divisors is an integer number (100532250).

Almost surely, 2^399919319 is an apocalyptic number.

399919319 is a deficient number, since it is larger than the sum of its proper divisors (2209681).

399919319 is a wasteful number, since it uses less digits than its factorization.

399919319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209680.

The product of its digits is 531441, while the sum is 53.

The square root of 399919319 is about 19997.9828732800. The cubic root of 399919319 is about 736.7567578395.

The spelling of 399919319 in words is "three hundred ninety-nine million, nine hundred nineteen thousand, three hundred nineteen".