18899424 has 72 divisors (see below), whose sum is σ = 54250560. Its totient is φ = 6240768.

The previous prime is 18899381. The next prime is 18899449. The reversal of 18899424 is 42499881.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18899424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39217 + ... + 39695.

It is an arithmetic number, because the mean of its divisors is an integer number (753480).

Almost surely, 2^18899424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18899424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27125280).

18899424 is an abundant number, since it is smaller than the sum of its proper divisors (35351136).

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

18899424 is a wasteful number, since it uses less digits than its factorization.

18899424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 621 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 18899424 is about 4347.3467770584. The cubic root of 18899424 is about 266.3684945021.

The spelling of 18899424 in words is "eighteen million, eight hundred ninety-nine thousand, four hundred twenty-four".