18332240 has 20 divisors (see below), whose sum is σ = 42622644. Its totient is φ = 7332864.

The previous prime is 18332231. The next prime is 18332243. The reversal of 18332240 is 4223381.

It can be written as a sum of positive squares in 2 ways, for example, as 5053504 + 13278736 = 2248^2 + 3644^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18332243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114497 + ... + 114656.

Almost surely, 2^18332240 is an apocalyptic number.

18332240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18332240 is an abundant number, since it is smaller than the sum of its proper divisors (24290404).

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

18332240 is a wasteful number, since it uses less digits than its factorization.

18332240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229166 (or 229160 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 18332240 is about 4281.6165171580. The cubic root of 18332240 is about 263.6767546662.

It can be divided in two parts, 183 and 32240, that added together give a palindrome (32423).

The spelling of 18332240 in words is "eighteen million, three hundred thirty-two thousand, two hundred forty".