18940943 has 4 divisors (see below), whose sum is σ = 21646800. Its totient is φ = 16235088.

The previous prime is 18940931. The next prime is 18940949. The reversal of 18940943 is 34904981.

18940943 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18940943 - 2⁸ = 18940687 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18940897 and 18940906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940949) 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, 1352918 + ... + 1352931.

It is an arithmetic number, because the mean of its divisors is an integer number (5411700).

Almost surely, 2^18940943 is an apocalyptic number.

18940943 is a deficient number, since it is larger than the sum of its proper divisors (2705857).

18940943 is an equidigital number, since it uses as much as digits as its factorization.

18940943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705856.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18940943 is about 4352.1193687674. The cubic root of 18940943 is about 266.5634081117.

The spelling of 18940943 in words is "eighteen million, nine hundred forty thousand, nine hundred forty-three".