18196943 has 4 divisors (see below), whose sum is σ = 18584160. Its totient is φ = 17809728.

The previous prime is 18196903. The next prime is 18196963. The reversal of 18196943 is 34969181.

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 18196943 - 2⁶ = 18196879 is a prime.

It is a super-2 number, since 2×18196943² = 662257469090498, 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 18196943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18196903) 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, 193538 + ... + 193631.

It is an arithmetic number, because the mean of its divisors is an integer number (4646040).

Almost surely, 2^18196943 is an apocalyptic number.

18196943 is a deficient number, since it is larger than the sum of its proper divisors (387217).

18196943 is an equidigital number, since it uses as much as digits as its factorization.

18196943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387216.

The product of its digits is 46656, while the sum is 41.

The square root of 18196943 is about 4265.7875005677. The cubic root of 18196943 is about 263.0264831866.

The spelling of 18196943 in words is "eighteen million, one hundred ninety-six thousand, nine hundred forty-three".