18707481 has 24 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 11412576.

The previous prime is 18707467. The next prime is 18707501. The reversal of 18707481 is 18470781.

It is not a de Polignac number, because 18707481 - 2⁵ = 18707449 is a prime.

It is a super-2 number, since 2×18707481² = 699939690730722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18707411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14230 + ... + 15488.

It is an arithmetic number, because the mean of its divisors is an integer number (1223040).

Almost surely, 2^18707481 is an apocalyptic number.

It is an amenable number.

18707481 is a deficient number, since it is larger than the sum of its proper divisors (10645479).

18707481 is a wasteful number, since it uses less digits than its factorization.

18707481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405 (or 1402 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 18707481 is about 4325.2145611519. The cubic root of 18707481 is about 265.4636761781.

The spelling of 18707481 in words is "eighteen million, seven hundred seven thousand, four hundred eighty-one".