18461898 has 144 divisors (see below), whose sum is σ = 53933760. Its totient is φ = 4582656.

The previous prime is 18461897. The next prime is 18461899. The reversal of 18461898 is 89816481.

It is an interprime number because it is at equal distance from previous prime (18461897) and next prime (18461899).

It is not an unprimeable number, because it can be changed into a prime (18461897) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1085986 + ... + 1086002.

It is an arithmetic number, because the mean of its divisors is an integer number (374540).

Almost surely, 2^18461898 is an apocalyptic number.

18461898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18461898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26966880).

18461898 is an abundant number, since it is smaller than the sum of its proper divisors (35471862).

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

18461898 is a wasteful number, since it uses less digits than its factorization.

18461898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 42 counting only the distinct ones).

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

The square root of 18461898 is about 4296.7310830444. The cubic root of 18461898 is about 264.2969283078.

The spelling of 18461898 in words is "eighteen million, four hundred sixty-one thousand, eight hundred ninety-eight".