18643072 has 32 divisors (see below), whose sum is σ = 42448320. Its totient is φ = 7989504.

The previous prime is 18643049. The next prime is 18643073. The reversal of 18643072 is 27034681.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (18643073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9508 + ... + 11299.

It is an arithmetic number, because the mean of its divisors is an integer number (1326510).

Almost surely, 2^18643072 is an apocalyptic number.

It is an amenable number.

18643072 is an abundant number, since it is smaller than the sum of its proper divisors (23805248).

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

18643072 is an equidigital number, since it uses as much as digits as its factorization.

18643072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20828 (or 20816 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 18643072 is about 4317.7623834574. The cubic root of 18643072 is about 265.1586661062.

The spelling of 18643072 in words is "eighteen million, six hundred forty-three thousand, seventy-two".