18440252 has 6 divisors (see below), whose sum is σ = 32270448. Its totient is φ = 9220124.

The previous prime is 18440251. The next prime is 18440263. The reversal of 18440252 is 25204481.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2305028 + ... + 2305035.

It is an arithmetic number, because the mean of its divisors is an integer number (5378408).

Almost surely, 2^18440252 is an apocalyptic number.

It is an amenable number.

18440252 is a deficient number, since it is larger than the sum of its proper divisors (13830196).

18440252 is a wasteful number, since it uses less digits than its factorization.

18440252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610067 (or 4610065 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 18440252 is about 4294.2114526418. The cubic root of 18440252 is about 264.1935946084.

The spelling of 18440252 in words is "eighteen million, four hundred forty thousand, two hundred fifty-two".