18817132 has 6 divisors (see below), whose sum is σ = 32929988. Its totient is φ = 9408564.

The previous prime is 18817111. The next prime is 18817133. The reversal of 18817132 is 23171881.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18817094 and 18817103.

It is not an unprimeable number, because it can be changed into a prime (18817133) 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 as a sum of consecutive naturals, namely, 2352138 + ... + 2352145.

Almost surely, 2^18817132 is an apocalyptic number.

It is an amenable number.

18817132 is a deficient number, since it is larger than the sum of its proper divisors (14112856).

18817132 is a wasteful number, since it uses less digits than its factorization.

18817132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704287 (or 4704285 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 18817132 is about 4337.8718284431. The cubic root of 18817132 is about 265.9813241830.

The spelling of 18817132 in words is "eighteen million, eight hundred seventeen thousand, one hundred thirty-two".