18494790 has 64 divisors (see below), whose sum is σ = 47485440. Its totient is φ = 4596480.

The previous prime is 18494767. The next prime is 18494797. The reversal of 18494790 is 9749481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18494797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40242 + ... + 40698.

It is an arithmetic number, because the mean of its divisors is an integer number (741960).

Almost surely, 2^18494790 is an apocalyptic number.

18494790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18494790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23742720).

18494790 is an abundant number, since it is smaller than the sum of its proper divisors (28990650).

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

18494790 is a wasteful number, since it uses less digits than its factorization.

18494790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18494790 is about 4300.5569406764. The cubic root of 18494790 is about 264.4537936707.

The spelling of 18494790 in words is "eighteen million, four hundred ninety-four thousand, seven hundred ninety".