399344782 has 4 divisors (see below), whose sum is σ = 599017176. Its totient is φ = 199672390.

The previous prime is 399344767. The next prime is 399344783. The reversal of 399344782 is 287443993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 287443993 = 3847 ⋅74719.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399344783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99836194 + ... + 99836197.

It is an arithmetic number, because the mean of its divisors is an integer number (149754294).

Almost surely, 2^399344782 is an apocalyptic number.

399344782 is a deficient number, since it is larger than the sum of its proper divisors (199672394).

399344782 is a wasteful number, since it uses less digits than its factorization.

399344782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199672393.

The product of its digits is 1306368, while the sum is 49.

The square root of 399344782 is about 19983.6128365218. The cubic root of 399344782 is about 736.4037725704.

The spelling of 399344782 in words is "three hundred ninety-nine million, three hundred forty-four thousand, seven hundred eighty-two".