399212913 has 8 divisors (see below), whose sum is σ = 580673376. Its totient is φ = 241947200.

The previous prime is 399212911. The next prime is 399212923. The reversal of 399212913 is 319212993.

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

It is not a de Polignac number, because 399212913 - 2¹ = 399212911 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399212911) 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, 6048648 + ... + 6048713.

It is an arithmetic number, because the mean of its divisors is an integer number (72584172).

Almost surely, 2^399212913 is an apocalyptic number.

399212913 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

399212913 is a deficient number, since it is larger than the sum of its proper divisors (181460463).

399212913 is a wasteful number, since it uses less digits than its factorization.

399212913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12097375.

The product of its digits is 26244, while the sum is 39.

The square root of 399212913 is about 19980.3131356843. The cubic root of 399212913 is about 736.3227068478.

It can be divided in two parts, 399 and 212913, that added together give a palindrome (213312).

The spelling of 399212913 in words is "three hundred ninety-nine million, two hundred twelve thousand, nine hundred thirteen".