399739226 has 4 divisors (see below), whose sum is σ = 599608842. Its totient is φ = 199869612.

The previous prime is 399739213. The next prime is 399739247. The reversal of 399739226 is 622937993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622937993 = 11863 ⋅52511.

It can be written as a sum of positive squares in only one way, i.e., 289510225 + 110229001 = 17015^2 + 10499^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99934805 + ... + 99934808.

Almost surely, 2^399739226 is an apocalyptic number.

399739226 is a deficient number, since it is larger than the sum of its proper divisors (199869616).

399739226 is a wasteful number, since it uses less digits than its factorization.

399739226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199869615.

The product of its digits is 1102248, while the sum is 50.

The square root of 399739226 is about 19993.4795871054. The cubic root of 399739226 is about 736.6461483153.

The spelling of 399739226 in words is "three hundred ninety-nine million, seven hundred thirty-nine thousand, two hundred twenty-six".