18213750 has 60 divisors (see below), whose sum is σ = 49343580. Its totient is φ = 4854000.

The previous prime is 18213737. The next prime is 18213751. The reversal of 18213750 is 5731281.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213751) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 10441 + ... + 12059.

It is an arithmetic number, because the mean of its divisors is an integer number (822393).

Almost surely, 2^18213750 is an apocalyptic number.

18213750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18213750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24671790).

18213750 is an abundant number, since it is smaller than the sum of its proper divisors (31129830).

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

18213750 is a wasteful number, since it uses less digits than its factorization.

18213750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647 (or 1629 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 18213750 is about 4267.7570221370. The cubic root of 18213750 is about 263.1074368170.

The spelling of 18213750 in words is "eighteen million, two hundred thirteen thousand, seven hundred fifty".