18513432 has 96 divisors (see below), whose sum is σ = 58000800. Its totient is φ = 5225472.

The previous prime is 18513409. The next prime is 18513437. The reversal of 18513432 is 23431581.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18513396 and 18513405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18513437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54768 + ... + 55104.

It is an arithmetic number, because the mean of its divisors is an integer number (604175).

Almost surely, 2^18513432 is an apocalyptic number.

18513432 is a gapful number since it is divisible by the number (12) 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 18513432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29000400).

18513432 is an abundant number, since it is smaller than the sum of its proper divisors (39487368).

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

18513432 is a wasteful number, since it uses less digits than its factorization.

18513432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 458 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 18513432 is about 4302.7237884856. The cubic root of 18513432 is about 264.5426167420.

The spelling of 18513432 in words is "eighteen million, five hundred thirteen thousand, four hundred thirty-two".