18420798 has 24 divisors (see below), whose sum is σ = 40496904. Its totient is φ = 5581840.

The previous prime is 18420791. The next prime is 18420811. The reversal of 18420798 is 89702481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420791) 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 11 ways as a sum of consecutive naturals, for example, 11961 + ... + 13412.

It is an arithmetic number, because the mean of its divisors is an integer number (1687371).

Almost surely, 2^18420798 is an apocalyptic number.

18420798 is an abundant number, since it is smaller than the sum of its proper divisors (22076106).

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

18420798 is a wasteful number, since it uses less digits than its factorization.

18420798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25400 (or 25389 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18420798 is about 4291.9457126110. The cubic root of 18420798 is about 264.1006560621.

The spelling of 18420798 in words is "eighteen million, four hundred twenty thousand, seven hundred ninety-eight".