18643703 has 4 divisors (see below), whose sum is σ = 20077848. Its totient is φ = 17209560.

The previous prime is 18643699. The next prime is 18643711. The reversal of 18643703 is 30734681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30734681 = 4327 ⋅7103.

It is a cyclic number.

It is not a de Polignac number, because 18643703 - 2² = 18643699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18643703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18643733) 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, 717053 + ... + 717078.

It is an arithmetic number, because the mean of its divisors is an integer number (5019462).

Almost surely, 2^18643703 is an apocalyptic number.

18643703 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18643703 is a deficient number, since it is larger than the sum of its proper divisors (1434145).

18643703 is a wasteful number, since it uses less digits than its factorization.

18643703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434144.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 18643703 is about 4317.8354530945. The cubic root of 18643703 is about 265.1616576238.

The spelling of 18643703 in words is "eighteen million, six hundred forty-three thousand, seven hundred three".