18207040 has 28 divisors (see below), whose sum is σ = 43356276. Its totient is φ = 7282688.

The previous prime is 18207031. The next prime is 18207043. The reversal of 18207040 is 4070281.

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 15872256 = 1528^2 + 3984^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18207043) 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, 28129 + ... + 28768.

Almost surely, 2^18207040 is an apocalyptic number.

18207040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18207040 is an abundant number, since it is smaller than the sum of its proper divisors (25149236).

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

18207040 is an equidigital number, since it uses as much as digits as its factorization.

18207040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56914 (or 56904 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 18207040 is about 4266.9708224922. The cubic root of 18207040 is about 263.0751229929.

The spelling of 18207040 in words is "eighteen million, two hundred seven thousand, forty".