18540798 has 24 divisors (see below), whose sum is σ = 37672584. Its totient is φ = 6083280.

The previous prime is 18540779. The next prime is 18540799. The reversal of 18540798 is 89704581.

It is a super-2 number, since 2×18540798² = 687522380953608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29940 + ... + 30552.

It is an arithmetic number, because the mean of its divisors is an integer number (1569691).

Almost surely, 2^18540798 is an apocalyptic number.

18540798 is an abundant number, since it is smaller than the sum of its proper divisors (19131786).

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

18540798 is an equidigital number, since it uses as much as digits as its factorization.

18540798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 18540798 is about 4305.9026928160. The cubic root of 18540798 is about 264.6728988910.

The spelling of 18540798 in words is "eighteen million, five hundred forty thousand, seven hundred ninety-eight".