399759974 has 4 divisors (see below), whose sum is σ = 599639964. Its totient is φ = 199879986.

The previous prime is 399759961. The next prime is 399759977. The reversal of 399759974 is 479957993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 479957993 = 19 ⋅25260947.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399759977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99939992 + ... + 99939995.

It is an arithmetic number, because the mean of its divisors is an integer number (149909991).

Almost surely, 2^399759974 is an apocalyptic number.

399759974 is a deficient number, since it is larger than the sum of its proper divisors (199879990).

399759974 is a wasteful number, since it uses less digits than its factorization.

399759974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199879989.

The product of its digits is 19289340, while the sum is 62.

The square root of 399759974 is about 19993.9984495348. The cubic root of 399759974 is about 736.6588930155.

Adding to 399759974 its sum of digits (62), we get a square (399760036 = 19994²).

The spelling of 399759974 in words is "three hundred ninety-nine million, seven hundred fifty-nine thousand, nine hundred seventy-four".