18401983 has 2 divisors, whose sum is σ = 18401984. Its totient is φ = 18401982.

The previous prime is 18401969. The next prime is 18402011. The reversal of 18401983 is 38910481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18401983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18401953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9200991 + 9200992.

It is an arithmetic number, because the mean of its divisors is an integer number (9200992).

Almost surely, 2^18401983 is an apocalyptic number.

18401983 is a deficient number, since it is larger than the sum of its proper divisors (1).

18401983 is an equidigital number, since it uses as much as digits as its factorization.

18401983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18401983 is about 4289.7532563074. The cubic root of 18401983 is about 264.0107079755.

The spelling of 18401983 in words is "eighteen million, four hundred one thousand, nine hundred eighty-three".