399331766 has 4 divisors (see below), whose sum is σ = 598997652. Its totient is φ = 199665882.

The previous prime is 399331763. The next prime is 399331781. The reversal of 399331766 is 667133993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 667133993 = 647 ⋅1031119.

It is a self number, because there is not a number n which added to its sum of digits gives 399331766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399331763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99832940 + ... + 99832943.

It is an arithmetic number, because the mean of its divisors is an integer number (149749413).

Almost surely, 2^399331766 is an apocalyptic number.

399331766 is a deficient number, since it is larger than the sum of its proper divisors (199665886).

399331766 is a wasteful number, since it uses less digits than its factorization.

399331766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199665885.

The product of its digits is 551124, while the sum is 47.

The square root of 399331766 is about 19983.2871670304. The cubic root of 399331766 is about 736.3957718518.

The spelling of 399331766 in words is "three hundred ninety-nine million, three hundred thirty-one thousand, seven hundred sixty-six".