18581036 has 24 divisors (see below), whose sum is σ = 33593616. Its totient is φ = 8986880.

The previous prime is 18581021. The next prime is 18581063. The reversal of 18581036 is 63018581.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 18580993 and 18581011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22055 + ... + 22881.

It is an arithmetic number, because the mean of its divisors is an integer number (1399734).

Almost surely, 2^18581036 is an apocalyptic number.

It is an amenable number.

18581036 is a deficient number, since it is larger than the sum of its proper divisors (15012580).

18581036 is a wasteful number, since it uses less digits than its factorization.

18581036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18581036 is about 4310.5725837758. The cubic root of 18581036 is about 264.8642285395.

The spelling of 18581036 in words is "eighteen million, five hundred eighty-one thousand, thirty-six".