18312250 has 32 divisors (see below), whose sum is σ = 37402560. Its totient is φ = 6658000.

The previous prime is 18312233. The next prime is 18312263. The reversal of 18312250 is 5221381.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580 + ... + 6079.

It is an arithmetic number, because the mean of its divisors is an integer number (1168830).

Almost surely, 2^18312250 is an apocalyptic number.

18312250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18312250 is an abundant number, since it is smaller than the sum of its proper divisors (19090310).

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

18312250 is a wasteful number, since it uses less digits than its factorization.

18312250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6687 (or 6677 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18312250 is about 4279.2814817443. The cubic root of 18312250 is about 263.5808795788.

The spelling of 18312250 in words is "eighteen million, three hundred twelve thousand, two hundred fifty".