18698240 has 104 divisors (see below), whose sum is σ = 49539168. Its totient is φ = 6717440.

The previous prime is 18698237. The next prime is 18698263. The reversal of 18698240 is 4289681.

It is a junction number, because it is equal to n+sod(n) for n = 18698194 and 18698203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225239 + ... + 225321.

Almost surely, 2^18698240 is an apocalyptic number.

18698240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18698240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24769584).

18698240 is an abundant number, since it is smaller than the sum of its proper divisors (30840928).

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

18698240 is an equidigital number, since it uses as much as digits as its factorization.

18698240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 18698240 is about 4324.1461584919. The cubic root of 18698240 is about 265.4199583044.

The spelling of 18698240 in words is "eighteen million, six hundred ninety-eight thousand, two hundred forty".