18420498 has 12 divisors (see below), whose sum is σ = 39911118. Its totient is φ = 6140160.

The previous prime is 18420491. The next prime is 18420517. The reversal of 18420498 is 89402481.

It can be written as a sum of positive squares in only one way, i.e., 14722569 + 3697929 = 3837^2 + 1923^2 .

It is not an unprimeable number, because it can be changed into a prime (18420491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 511663 + ... + 511698.

Almost surely, 2^18420498 is an apocalyptic number.

18420498 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18420498 is an abundant number, since it is smaller than the sum of its proper divisors (21490620).

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

18420498 is a wasteful number, since it uses less digits than its factorization.

18420498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023369 (or 1023366 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18420498 is about 4291.9107632848. The cubic root of 18420498 is about 264.0992223453.

The spelling of 18420498 in words is "eighteen million, four hundred twenty thousand, four hundred ninety-eight".