18212380 has 12 divisors (see below), whose sum is σ = 38246040. Its totient is φ = 7284944.

The previous prime is 18212371. The next prime is 18212387. The reversal of 18212380 is 8321281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455290 + ... + 455329.

It is an arithmetic number, because the mean of its divisors is an integer number (3187170).

Almost surely, 2^18212380 is an apocalyptic number.

18212380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18212380 is an abundant number, since it is smaller than the sum of its proper divisors (20033660).

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

18212380 is a wasteful number, since it uses less digits than its factorization.

18212380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910628 (or 910626 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18212380 is about 4267.5965132613. The cubic root of 18212380 is about 263.1008398555.

The spelling of 18212380 in words is "eighteen million, two hundred twelve thousand, three hundred eighty".