18481432 has 16 divisors (see below), whose sum is σ = 34808760. Its totient is φ = 9199104.

The previous prime is 18481427. The next prime is 18481459. The reversal of 18481432 is 23418481.

It is a junction number, because it is equal to n+sod(n) for n = 18481394 and 18481403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3273 + ... + 6904.

Almost surely, 2^18481432 is an apocalyptic number.

It is an amenable number.

18481432 is a deficient number, since it is larger than the sum of its proper divisors (16327328).

18481432 is a wasteful number, since it uses less digits than its factorization.

18481432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10410 (or 10406 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 18481432 is about 4299.0036054881. The cubic root of 18481432 is about 264.3901104282.

Subtracting from 18481432 its sum of digits (31), we obtain a square (18481401 = 4299²).

The spelling of 18481432 in words is "eighteen million, four hundred eighty-one thousand, four hundred thirty-two".