18640063 has 8 divisors (see below), whose sum is σ = 20109600. Its totient is φ = 17175648.

The previous prime is 18640043. The next prime is 18640067. The reversal of 18640063 is 36004681.

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

It is a cyclic number.

It is not a de Polignac number, because 18640063 - 2⁵ = 18640031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10053 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (2513700).

Almost surely, 2^18640063 is an apocalyptic number.

18640063 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18640063 is a deficient number, since it is larger than the sum of its proper divisors (1469537).

18640063 is a wasteful number, since it uses less digits than its factorization.

18640063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 18640063 is about 4317.4139250250. The cubic root of 18640063 is about 265.1443997637.

The spelling of 18640063 in words is "eighteen million, six hundred forty thousand, sixty-three".