18128332 has 24 divisors (see below), whose sum is σ = 32550336. Its totient is φ = 8830848.

The previous prime is 18128329. The next prime is 18128333. The reversal of 18128332 is 23382181.

18128332 is nontrivially palindromic in base 3.

It is a super-2 number, since 2×18128332² = 657272842204448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18128332.

It is not an unprimeable number, because it can be changed into a prime (18128333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49213 + ... + 49579.

It is an arithmetic number, because the mean of its divisors is an integer number (1356264).

Almost surely, 2^18128332 is an apocalyptic number.

It is an amenable number.

18128332 is a deficient number, since it is larger than the sum of its proper divisors (14422004).

18128332 is a wasteful number, since it uses less digits than its factorization.

18128332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 655 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 18128332 is about 4257.7378970528. The cubic root of 18128332 is about 262.6954891485.

The spelling of 18128332 in words is "eighteen million, one hundred twenty-eight thousand, three hundred thirty-two".