18475481 has 6 divisors (see below), whose sum is σ = 19626510. Its totient is φ = 17388416.

The previous prime is 18475477. The next prime is 18475507. The reversal of 18475481 is 18457481.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3575881 + 14899600 = 1891^2 + 3860^2 .

It is not a de Polignac number, because 18475481 - 2² = 18475477 is a prime.

It is a super-2 number, since 2×18475481² = 682686796362722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18475441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31676 + ... + 32253.

It is an arithmetic number, because the mean of its divisors is an integer number (3271085).

Almost surely, 2^18475481 is an apocalyptic number.

It is an amenable number.

18475481 is a deficient number, since it is larger than the sum of its proper divisors (1151029).

18475481 is an equidigital number, since it uses as much as digits as its factorization.

18475481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63963 (or 63946 counting only the distinct ones).

The product of its digits is 35840, while the sum is 38.

The square root of 18475481 is about 4298.3114126364. The cubic root of 18475481 is about 264.3617296105.

The spelling of 18475481 in words is "eighteen million, four hundred seventy-five thousand, four hundred eighty-one".