18266240 has 32 divisors (see below), whose sum is σ = 43669260. Its totient is φ = 7306240.

The previous prime is 18266233. The next prime is 18266243. The reversal of 18266240 is 4266281.

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 760384 = 4184^2 + 872^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (18266243) 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, 13631 + ... + 14910.

Almost surely, 2^18266240 is an apocalyptic number.

18266240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18266240 is an abundant number, since it is smaller than the sum of its proper divisors (25403020).

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

18266240 is an equidigital number, since it uses as much as digits as its factorization.

18266240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28560 (or 28548 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 18266240 is about 4273.9021982259. The cubic root of 18266240 is about 263.3599431886.

The spelling of 18266240 in words is "eighteen million, two hundred sixty-six thousand, two hundred forty".