399456413 has 4 divisors (see below), whose sum is σ = 400002108. Its totient is φ = 398910720.

The previous prime is 399456401. The next prime is 399456419. The reversal of 399456413 is 314654993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 314654993 = 37 ⋅8504189.

It can be written as a sum of positive squares in 2 ways, for example, as 200448964 + 199007449 = 14158^2 + 14107^2 .

It is a cyclic number.

It is not a de Polignac number, because 399456413 - 2⁶ = 399456349 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 (399456419) 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, 271748 + ... + 273213.

It is an arithmetic number, because the mean of its divisors is an integer number (100000527).

Almost surely, 2^399456413 is an apocalyptic number.

It is an amenable number.

399456413 is a deficient number, since it is larger than the sum of its proper divisors (545695).

399456413 is an equidigital number, since it uses as much as digits as its factorization.

399456413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545694.

The product of its digits is 349920, while the sum is 44.

The square root of 399456413 is about 19986.4057048785. The cubic root of 399456413 is about 736.4723831501.

It can be divided in two parts, 3994 and 56413, that multiplied together give a palindrome (225313522).

The spelling of 399456413 in words is "three hundred ninety-nine million, four hundred fifty-six thousand, four hundred thirteen".