18041994 has 32 divisors (see below), whose sum is σ = 40296000. Its totient is φ = 5983632.

The previous prime is 18041987. The next prime is 18042029. The reversal of 18041994 is 49914081.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11637 + ... + 13095.

It is an arithmetic number, because the mean of its divisors is an integer number (1259250).

Almost surely, 2^18041994 is an apocalyptic number.

18041994 is an abundant number, since it is smaller than the sum of its proper divisors (22254006).

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

18041994 is a wasteful number, since it uses less digits than its factorization.

18041994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18041994 is about 4247.5868443153. The cubic root of 18041994 is about 262.2777874550.

The spelling of 18041994 in words is "eighteen million, forty-one thousand, nine hundred ninety-four".