18166406 has 4 divisors (see below), whose sum is σ = 27249612. Its totient is φ = 9083202.

The previous prime is 18166397. The next prime is 18166429. The reversal of 18166406 is 60466181.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4541600 + ... + 4541603.

It is an arithmetic number, because the mean of its divisors is an integer number (6812403).

Almost surely, 2^18166406 is an apocalyptic number.

18166406 is a deficient number, since it is larger than the sum of its proper divisors (9083206).

18166406 is an equidigital number, since it uses as much as digits as its factorization.

18166406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9083205.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 18166406 is about 4262.2067054520. The cubic root of 18166406 is about 262.8792691396.

The spelling of 18166406 in words is "eighteen million, one hundred sixty-six thousand, four hundred six".