399251164474 has 4 divisors (see below), whose sum is σ = 598876746714. Its totient is φ = 199625582236.

The previous prime is 399251164471. The next prime is 399251164493. The reversal of 399251164474 is 474461152993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 398296045449 + 955119025 = 631107^2 + 30905^2 .

It is not an unprimeable number, because it can be changed into a prime (399251164471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99812791117 + ... + 99812791120.

Almost surely, 2^399251164474 is an apocalyptic number.

399251164474 is a deficient number, since it is larger than the sum of its proper divisors (199625582240).

399251164474 is a wasteful number, since it uses less digits than its factorization.

399251164474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199625582239.

The product of its digits is 6531840, while the sum is 55.

The spelling of 399251164474 in words is "three hundred ninety-nine billion, two hundred fifty-one million, one hundred sixty-four thousand, four hundred seventy-four".