18640653 has 16 divisors (see below), whose sum is σ = 27702720. Its totient is φ = 11079936.

The previous prime is 18640639. The next prime is 18640663. The reversal of 18640653 is 35604681.

It is not a de Polignac number, because 18640653 - 2⁵ = 18640621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640663) 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 15 ways as a sum of consecutive naturals, for example, 8650 + ... + 10587.

It is an arithmetic number, because the mean of its divisors is an integer number (1731420).

Almost surely, 2^18640653 is an apocalyptic number.

It is an amenable number.

18640653 is a deficient number, since it is larger than the sum of its proper divisors (9062067).

18640653 is a wasteful number, since it uses less digits than its factorization.

18640653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19276.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 18640653 is about 4317.4822524244. The cubic root of 18640653 is about 265.1471972067.

The spelling of 18640653 in words is "eighteen million, six hundred forty thousand, six hundred fifty-three".