18298840 has 32 divisors (see below), whose sum is σ = 47054880. Its totient is φ = 6273792.

The previous prime is 18298807. The next prime is 18298853. The reversal of 18298840 is 4889281.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 18298793 and 18298802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32397 + ... + 32956.

It is an arithmetic number, because the mean of its divisors is an integer number (1470465).

Almost surely, 2^18298840 is an apocalyptic number.

18298840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18298840 is an abundant number, since it is smaller than the sum of its proper divisors (28756040).

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

18298840 is a wasteful number, since it uses less digits than its factorization.

18298840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65371 (or 65367 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18298840 is about 4277.7143429640. The cubic root of 18298840 is about 263.5165240656.

The spelling of 18298840 in words is "eighteen million, two hundred ninety-eight thousand, eight hundred forty".