402686166 has 16 divisors (see below), whose sum is σ = 805584384. Its totient is φ = 134193384.

The previous prime is 402686159. The next prime is 402686173. The reversal of 402686166 is 661686204.

It is an interprime number because it is at equal distance from previous prime (402686159) and next prime (402686173).

It is a super-2 number, since 2×402686166² = 324312296575559112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27091 + ... + 39233.

It is an arithmetic number, because the mean of its divisors is an integer number (50349024).

Almost surely, 2^402686166 is an apocalyptic number.

402686166 is an abundant number, since it is smaller than the sum of its proper divisors (402898218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402686166 is a wasteful number, since it uses less digits than its factorization.

402686166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17675.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 402686166 is about 20067.0417849767. The cubic root of 402686166 is about 738.4519415102.

The spelling of 402686166 in words is "four hundred two million, six hundred eighty-six thousand, one hundred sixty-six".