18381712 has 10 divisors (see below), whose sum is σ = 35614598. Its totient is φ = 9190848.

The previous prime is 18381691. The next prime is 18381731. The reversal of 18381712 is 21718381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 2027776 = 4044^2 + 1424^2 .

It is an unprimeable number.

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, 574413 + ... + 574444.

Almost surely, 2^18381712 is an apocalyptic number.

It is an amenable number.

18381712 is a deficient number, since it is larger than the sum of its proper divisors (17232886).

18381712 is a wasteful number, since it uses less digits than its factorization.

18381712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148865 (or 1148859 counting only the distinct ones).

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

The square root of 18381712 is about 4287.3898819678. The cubic root of 18381712 is about 263.9137306123.

The spelling of 18381712 in words is "eighteen million, three hundred eighty-one thousand, seven hundred twelve".