399349439 has 8 divisors (see below), whose sum is σ = 404981808. Its totient is φ = 393756480.

The previous prime is 399349427. The next prime is 399349441. The reversal of 399349439 is 934943993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399349439 - 2¹⁶ = 399283903 is a prime.

It is a super-2 number, since 2×399349439² = 318959948859229442, 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 (399349469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10859 + ... + 30275.

It is an arithmetic number, because the mean of its divisors is an integer number (50622726).

Almost surely, 2^399349439 is an apocalyptic number.

399349439 is a deficient number, since it is larger than the sum of its proper divisors (5632369).

399349439 is a wasteful number, since it uses less digits than its factorization.

399349439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19705.

The product of its digits is 2834352, while the sum is 53.

The square root of 399349439 is about 19983.7293566541. The cubic root of 399349439 is about 736.4066351086.

The spelling of 399349439 in words is "three hundred ninety-nine million, three hundred forty-nine thousand, four hundred thirty-nine".