18886540 has 24 divisors (see below), whose sum is σ = 41030640. Its totient is φ = 7293888.

The previous prime is 18886537. The next prime is 18886547. The reversal of 18886540 is 4568881.

It is a junction number, because it is equal to n+sod(n) for n = 18886493 and 18886502.

It is not an unprimeable number, because it can be changed into a prime (18886547) 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, 15702 + ... + 16861.

It is an arithmetic number, because the mean of its divisors is an integer number (1709610).

Almost surely, 2^18886540 is an apocalyptic number.

18886540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18886540 is an abundant number, since it is smaller than the sum of its proper divisors (22144100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18886540 is a wasteful number, since it uses less digits than its factorization.

18886540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32601 (or 32599 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 18886540 is about 4345.8647010693. The cubic root of 18886540 is about 266.3079517076.

The spelling of 18886540 in words is "eighteen million, eight hundred eighty-six thousand, five hundred forty".