18715212 has 60 divisors (see below), whose sum is σ = 50006880. Its totient is φ = 6100704.

The previous prime is 18715211. The next prime is 18715223. The reversal of 18715212 is 21251781.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18715211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14614 + ... + 15842.

It is an arithmetic number, because the mean of its divisors is an integer number (833448).

Almost surely, 2^18715212 is an apocalyptic number.

18715212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18715212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25003440).

18715212 is an abundant number, since it is smaller than the sum of its proper divisors (31291668).

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

18715212 is a wasteful number, since it uses less digits than its factorization.

18715212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 1281 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 18715212 is about 4326.1081817264. The cubic root of 18715212 is about 265.5002393946.

Adding to 18715212 its reverse (21251781), we get a palindrome (39966993).

The spelling of 18715212 in words is "eighteen million, seven hundred fifteen thousand, two hundred twelve".