18680481 has 12 divisors (see below), whose sum is σ = 27353508. Its totient is φ = 12282624.

The previous prime is 18680443. The next prime is 18680503. The reversal of 18680481 is 18408681.

It can be written as a sum of positive squares in 2 ways, for example, as 8946081 + 9734400 = 2991^2 + 3120^2 .

It is not a de Polignac number, because 18680481 - 2⁷ = 18680353 is a prime.

It is a super-2 number, since 2×18680481² = 697920740782722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18680411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13560 + ... + 14873.

It is an arithmetic number, because the mean of its divisors is an integer number (2279459).

Almost surely, 2^18680481 is an apocalyptic number.

It is an amenable number.

18680481 is a deficient number, since it is larger than the sum of its proper divisors (8673027).

18680481 is a wasteful number, since it uses less digits than its factorization.

18680481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28512 (or 28509 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18680481 is about 4322.0922017005. The cubic root of 18680481 is about 265.3359025127.

The spelling of 18680481 in words is "eighteen million, six hundred eighty thousand, four hundred eighty-one".