18618380 has 24 divisors (see below), whose sum is σ = 42653520. Its totient is φ = 6770240.

The previous prime is 18618373. The next prime is 18618389. The reversal of 18618380 is 8381681.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18618380.

It is not an unprimeable number, because it can be changed into a prime (18618389) 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, 42095 + ... + 42534.

It is an arithmetic number, because the mean of its divisors is an integer number (1777230).

Almost surely, 2^18618380 is an apocalyptic number.

18618380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18618380 is an abundant number, since it is smaller than the sum of its proper divisors (24035140).

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

18618380 is a wasteful number, since it uses less digits than its factorization.

18618380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84649 (or 84647 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18618380 is about 4314.9020846365. The cubic root of 18618380 is about 265.0415503853.

The spelling of 18618380 in words is "eighteen million, six hundred eighteen thousand, three hundred eighty".