18406943 has 2 divisors, whose sum is σ = 18406944. Its totient is φ = 18406942.

The previous prime is 18406931. The next prime is 18406951. The reversal of 18406943 is 34960481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18406943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18406043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9203471 + 9203472.

It is an arithmetic number, because the mean of its divisors is an integer number (9203472).

Almost surely, 2^18406943 is an apocalyptic number.

18406943 is a deficient number, since it is larger than the sum of its proper divisors (1).

18406943 is an equidigital number, since it uses as much as digits as its factorization.

18406943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 18406943 is about 4290.3313391858. The cubic root of 18406943 is about 264.0344259896.

The spelling of 18406943 in words is "eighteen million, four hundred six thousand, nine hundred forty-three".