18921252 has 48 divisors (see below), whose sum is σ = 51497600. Its totient is φ = 5404896.

The previous prime is 18921251. The next prime is 18921257. The reversal of 18921252 is 25212981.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18921251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1818 + ... + 6414.

Almost surely, 2^18921252 is an apocalyptic number.

18921252 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 18921252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25748800).

18921252 is an abundant number, since it is smaller than the sum of its proper divisors (32576348).

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

18921252 is a wasteful number, since it uses less digits than its factorization.

18921252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625 (or 4609 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 18921252 is about 4349.8565493588. The cubic root of 18921252 is about 266.4710029969.

The spelling of 18921252 in words is "eighteen million, nine hundred twenty-one thousand, two hundred fifty-two".