18636634 has 8 divisors (see below), whose sum is σ = 28101888. Its totient is φ = 9269340.

The previous prime is 18636619. The next prime is 18636661. The reversal of 18636634 is 43663681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18636593 and 18636602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24012 + ... + 24775.

It is an arithmetic number, because the mean of its divisors is an integer number (3512736).

Almost surely, 2^18636634 is an apocalyptic number.

18636634 is a deficient number, since it is larger than the sum of its proper divisors (9465254).

18636634 is a wasteful number, since it uses less digits than its factorization.

18636634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48980.

The product of its digits is 62208, while the sum is 37.

The square root of 18636634 is about 4317.0167940373. The cubic root of 18636634 is about 265.1281402352.

The spelling of 18636634 in words is "eighteen million, six hundred thirty-six thousand, six hundred thirty-four".