399819166 has 16 divisors (see below), whose sum is σ = 658742400. Its totient is φ = 181153368.

The previous prime is 399819163. The next prime is 399819169. The reversal of 399819166 is 661918993.

It is an interprime number because it is at equal distance from previous prime (399819163) and next prime (399819169).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399819163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227856 + ... + 229603.

It is an arithmetic number, because the mean of its divisors is an integer number (41171400).

Almost surely, 2^399819166 is an apocalyptic number.

399819166 is a deficient number, since it is larger than the sum of its proper divisors (258923234).

399819166 is a wasteful number, since it uses less digits than its factorization.

399819166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457503.

The product of its digits is 629856, while the sum is 52.

The square root of 399819166 is about 19995.4786389324. The cubic root of 399819166 is about 736.6952499664.

The spelling of 399819166 in words is "three hundred ninety-nine million, eight hundred nineteen thousand, one hundred sixty-six".