18352240 has 20 divisors (see below), whose sum is σ = 42669144. Its totient is φ = 7340864.

The previous prime is 18352237. The next prime is 18352241. The reversal of 18352240 is 4225381.

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 (18352241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114622 + ... + 114781.

Almost surely, 2^18352240 is an apocalyptic number.

18352240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18352240 is an abundant number, since it is smaller than the sum of its proper divisors (24316904).

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

18352240 is a wasteful number, since it uses less digits than its factorization.

18352240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229416 (or 229410 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 18352240 is about 4283.9514469704. The cubic root of 18352240 is about 263.7726079914.

The spelling of 18352240 in words is "eighteen million, three hundred fifty-two thousand, two hundred forty".