18281632 has 24 divisors (see below), whose sum is σ = 36088416. Its totient is φ = 9116352.

The previous prime is 18281621. The next prime is 18281633. The reversal of 18281632 is 23618281.

It is a junction number, because it is equal to n+sod(n) for n = 18281594 and 18281603.

It is not an unprimeable number, because it can be changed into a prime (18281633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20263 + ... + 21145.

It is an arithmetic number, because the mean of its divisors is an integer number (1503684).

Almost surely, 2^18281632 is an apocalyptic number.

It is an amenable number.

18281632 is a deficient number, since it is larger than the sum of its proper divisors (17806784).

18281632 is an equidigital number, since it uses as much as digits as its factorization.

18281632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540 (or 1532 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 18281632 is about 4275.7025153769. The cubic root of 18281632 is about 263.4338956127.

The spelling of 18281632 in words is "eighteen million, two hundred eighty-one thousand, six hundred thirty-two".