18446240 has 48 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 7138560.

The previous prime is 18446237. The next prime is 18446243. The reversal of 18446240 is 4264481.

It is an interprime number because it is at equal distance from previous prime (18446237) and next prime (18446243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18446243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3101 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (937440).

Almost surely, 2^18446240 is an apocalyptic number.

18446240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18446240 is the 2480-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18446240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22498560).

18446240 is an abundant number, since it is smaller than the sum of its proper divisors (26550880).

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

18446240 is a wasteful number, since it uses less digits than its factorization.

18446240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3765 (or 3757 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 18446240 is about 4294.9086136960. The cubic root of 18446240 is about 264.2221882169. Note that the first 3 decimals are identical.

The spelling of 18446240 in words is "eighteen million, four hundred forty-six thousand, two hundred forty".