18641898 has 24 divisors (see below), whose sum is σ = 44063136. Its totient is φ = 5649000.

The previous prime is 18641893. The next prime is 18641899. The reversal of 18641898 is 89814681.

It is a super-2 number, since 2×18641898² = 695040722084808, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18641893) 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, 46878 + ... + 47273.

It is an arithmetic number, because the mean of its divisors is an integer number (1835964).

Almost surely, 2^18641898 is an apocalyptic number.

18641898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18641898 is an abundant number, since it is smaller than the sum of its proper divisors (25421238).

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

18641898 is a wasteful number, since it uses less digits than its factorization.

18641898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94170 (or 94167 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 18641898 is about 4317.6264312698. The cubic root of 18641898 is about 265.1531000921.

The spelling of 18641898 in words is "eighteen million, six hundred forty-one thousand, eight hundred ninety-eight".