18040494 has 16 divisors (see below), whose sum is σ = 37325520. Its totient is φ = 5806080.

The previous prime is 18040471. The next prime is 18040499. The reversal of 18040494 is 49404081.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51667 + ... + 52014.

It is an arithmetic number, because the mean of its divisors is an integer number (2332845).

Almost surely, 2^18040494 is an apocalyptic number.

18040494 is an abundant number, since it is smaller than the sum of its proper divisors (19285026).

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

18040494 is a wasteful number, since it uses less digits than its factorization.

18040494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103715.

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

The square root of 18040494 is about 4247.4102697997. The cubic root of 18040494 is about 262.2705187170.

The spelling of 18040494 in words is "eighteen million, forty thousand, four hundred ninety-four".