18450840 has 32 divisors (see below), whose sum is σ = 55352880. Its totient is φ = 4920192.

The previous prime is 18450833. The next prime is 18450847. The reversal of 18450840 is 4805481.

It is an interprime number because it is at equal distance from previous prime (18450833) and next prime (18450847).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18450798 and 18450807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18450847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76759 + ... + 76998.

Almost surely, 2^18450840 is an apocalyptic number.

18450840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18450840 is an abundant number, since it is smaller than the sum of its proper divisors (36902040).

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

18450840 is a wasteful number, since it uses less digits than its factorization.

18450840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153771 (or 153767 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18450840 is about 4295.4440981114. Note that the first 3 decimals coincide. The cubic root of 18450840 is about 264.2441497123.

The spelling of 18450840 in words is "eighteen million, four hundred fifty thousand, eight hundred forty".