18963943 has 8 divisors (see below), whose sum is σ = 19532912. Its totient is φ = 18398016.

The previous prime is 18963911. The next prime is 18963947. The reversal of 18963943 is 34936981.

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 18963943 - 2⁵ = 18963911 is a prime.

It is a super-2 number, since 2×18963943² = 719262268214498, which contains 22 as substring.

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 18963943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18963947) 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, 19771 + ... + 20707.

It is an arithmetic number, because the mean of its divisors is an integer number (2441614).

Almost surely, 2^18963943 is an apocalyptic number.

18963943 is a deficient number, since it is larger than the sum of its proper divisors (568969).

18963943 is an equidigital number, since it uses as much as digits as its factorization.

18963943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521.

The product of its digits is 139968, while the sum is 43.

The square root of 18963943 is about 4354.7609578483. The cubic root of 18963943 is about 266.6712605111.

The spelling of 18963943 in words is "eighteen million, nine hundred sixty-three thousand, nine hundred forty-three".