18402941 has 2 divisors, whose sum is σ = 18402942. Its totient is φ = 18402940.

The previous prime is 18402931. The next prime is 18402947. The reversal of 18402941 is 14920481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11874916 + 6528025 = 3446^2 + 2555^2 .

It is a cyclic number.

It is not a de Polignac number, because 18402941 - 2⁶ = 18402877 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18402947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9201470 + 9201471.

It is an arithmetic number, because the mean of its divisors is an integer number (9201471).

Almost surely, 2^18402941 is an apocalyptic number.

It is an amenable number.

18402941 is a deficient number, since it is larger than the sum of its proper divisors (1).

18402941 is an equidigital number, since it uses as much as digits as its factorization.

18402941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18402941 is about 4289.8649162882. The cubic root of 18402941 is about 264.0152893272.

The spelling of 18402941 in words is "eighteen million, four hundred two thousand, nine hundred forty-one".