18643696 has 20 divisors (see below), whose sum is σ = 38247552. Its totient is φ = 8773376.

The previous prime is 18643657. The next prime is 18643697. The reversal of 18643696 is 69634681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18643697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34000 + ... + 34543.

Almost surely, 2^18643696 is an apocalyptic number.

18643696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18643696 is an abundant number, since it is smaller than the sum of its proper divisors (19603856).

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

18643696 is a wasteful number, since it uses less digits than its factorization.

18643696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68568 (or 68562 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 18643696 is about 4317.8346425031. The cubic root of 18643696 is about 265.1616244378.

The spelling of 18643696 in words is "eighteen million, six hundred forty-three thousand, six hundred ninety-six".