18424440 has 96 divisors (see below), whose sum is σ = 60933600. Its totient is φ = 4826880.

The previous prime is 18424411. The next prime is 18424451. The reversal of 18424440 is 4442481.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21541 + ... + 22379.

It is an arithmetic number, because the mean of its divisors is an integer number (634725).

Almost surely, 2^18424440 is an apocalyptic number.

18424440 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 18424440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30466800).

18424440 is an abundant number, since it is smaller than the sum of its proper divisors (42509160).

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

18424440 is a wasteful number, since it uses less digits than its factorization.

18424440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 18424440 is about 4292.3699747342. The cubic root of 18424440 is about 264.1180601436.

The spelling of 18424440 in words is "eighteen million, four hundred twenty-four thousand, four hundred forty".