399782974 has 4 divisors (see below), whose sum is σ = 599674464. Its totient is φ = 199891486.

The previous prime is 399782969. The next prime is 399782983. The reversal of 399782974 is 479287993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 479287993 = 31 ⋅15460903.

It is a Smith number, since the sum of its digits (58) 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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99945742 + ... + 99945745.

It is an arithmetic number, because the mean of its divisors is an integer number (149918616).

Almost surely, 2^399782974 is an apocalyptic number.

399782974 is a deficient number, since it is larger than the sum of its proper divisors (199891490).

399782974 is a wasteful number, since it uses less digits than its factorization.

399782974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199891489.

The product of its digits is 6858432, while the sum is 58.

The square root of 399782974 is about 19994.5736138583. The cubic root of 399782974 is about 736.6730205176.

The spelling of 399782974 in words is "three hundred ninety-nine million, seven hundred eighty-two thousand, nine hundred seventy-four".