18621252 has 60 divisors (see below), whose sum is σ = 52436076. Its totient is φ = 5728320.

The previous prime is 18621247. The next prime is 18621263. The reversal of 18621252 is 25212681.

It is a happy number.

18621252 is a `hidden beast` number, since 18 + 621 + 25 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9036036 + 9585216 = 3006^2 + 3096^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2002 + ... + 6422.

Almost surely, 2^18621252 is an apocalyptic number.

18621252 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 18621252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26218038).

18621252 is an abundant number, since it is smaller than the sum of its proper divisors (33814824).

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

18621252 is a wasteful number, since it uses less digits than its factorization.

18621252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4450 (or 4439 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 18621252 is about 4315.2348719392. The cubic root of 18621252 is about 265.0551777828.

The spelling of 18621252 in words is "eighteen million, six hundred twenty-one thousand, two hundred fifty-two".