18732081 has 8 divisors (see below), whose sum is σ = 26290720. Its totient is φ = 11830752.

The previous prime is 18732073. The next prime is 18732089. The reversal of 18732081 is 18023781.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18732073) and next prime (18732089).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18732081 - 2³ = 18732073 is a prime.

It is a super-2 number, since 2×18732081² = 701781717181122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18732089) 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, 164260 + ... + 164373.

It is an arithmetic number, because the mean of its divisors is an integer number (3286340).

Almost surely, 2^18732081 is an apocalyptic number.

It is an amenable number.

18732081 is a deficient number, since it is larger than the sum of its proper divisors (7558639).

18732081 is a wasteful number, since it uses less digits than its factorization.

18732081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328655.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18732081 is about 4328.0574164399. The cubic root of 18732081 is about 265.5799851931.

The spelling of 18732081 in words is "eighteen million, seven hundred thirty-two thousand, eighty-one".