18140646 has 32 divisors (see below), whose sum is σ = 37296000. Its totient is φ = 5880384.

The previous prime is 18140627. The next prime is 18140653. The reversal of 18140646 is 64604181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36105 + ... + 36603.

It is an arithmetic number, because the mean of its divisors is an integer number (1165500).

Almost surely, 2^18140646 is an apocalyptic number.

18140646 is an abundant number, since it is smaller than the sum of its proper divisors (19155354).

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

18140646 is a wasteful number, since it uses less digits than its factorization.

18140646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18140646 is about 4259.1837246120. The cubic root of 18140646 is about 262.7549559193.

The spelling of 18140646 in words is "eighteen million, one hundred forty thousand, six hundred forty-six".