18440994 has 32 divisors (see below), whose sum is σ = 43331904. Its totient is φ = 5158080.

The previous prime is 18440993. The next prime is 18440999. The reversal of 18440994 is 49904481.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18440993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9889 + ... + 11604.

It is an arithmetic number, because the mean of its divisors is an integer number (1354122).

Almost surely, 2^18440994 is an apocalyptic number.

18440994 is an abundant number, since it is smaller than the sum of its proper divisors (24890910).

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

18440994 is a wasteful number, since it uses less digits than its factorization.

18440994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21522.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18440994 is about 4294.2978471457. The cubic root of 18440994 is about 264.1971381069.

The spelling of 18440994 in words is "eighteen million, four hundred forty thousand, nine hundred ninety-four".