18424640 has 112 divisors (see below), whose sum is σ = 48816768. Its totient is φ = 6580224.

The previous prime is 18424639. The next prime is 18424663. The reversal of 18424640 is 4642481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178829 + ... + 178931.

It is an arithmetic number, because the mean of its divisors is an integer number (435864).

Almost surely, 2^18424640 is an apocalyptic number.

18424640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18424640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24408384).

18424640 is an abundant number, since it is smaller than the sum of its proper divisors (30392128).

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

18424640 is a wasteful number, since it uses less digits than its factorization.

18424640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 166 counting only the distinct ones).

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

The square root of 18424640 is about 4292.3932718240. The cubic root of 18424640 is about 264.1190158202.

The spelling of 18424640 in words is "eighteen million, four hundred twenty-four thousand, six hundred forty".