18147432 has 64 divisors (see below), whose sum is σ = 50587200. Its totient is φ = 5391360.

The previous prime is 18147421. The next prime is 18147457. The reversal of 18147432 is 23474181.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18147432.

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, 6582 + ... + 8922.

It is an arithmetic number, because the mean of its divisors is an integer number (790425).

Almost surely, 2^18147432 is an apocalyptic number.

18147432 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 18147432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25293600).

18147432 is an abundant number, since it is smaller than the sum of its proper divisors (32439768).

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

18147432 is a wasteful number, since it uses less digits than its factorization.

18147432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2382 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 18147432 is about 4259.9802816445. The cubic root of 18147432 is about 262.7877153709.

The spelling of 18147432 in words is "eighteen million, one hundred forty-seven thousand, four hundred thirty-two".