18253440 has 96 divisors (see below), whose sum is σ = 63051300. Its totient is φ = 4866048.

The previous prime is 18253423. The next prime is 18253463. The reversal of 18253440 is 4435281.

It can be written as a sum of positive squares in 2 ways, for example, as 18045504 + 207936 = 4248^2 + 456^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4176 + ... + 7344.

Almost surely, 2^18253440 is an apocalyptic number.

18253440 is a gapful number since it is divisible by the number (10) 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 18253440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31525650).

18253440 is an abundant number, since it is smaller than the sum of its proper divisors (44797860).

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

18253440 is a wasteful number, since it uses less digits than its factorization.

18253440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194 (or 3179 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18253440 is about 4272.4044752341. The cubic root of 18253440 is about 263.2984126458.

The spelling of 18253440 in words is "eighteen million, two hundred fifty-three thousand, four hundred forty".