18483721 has 2 divisors, whose sum is σ = 18483722. Its totient is φ = 18483720.

The previous prime is 18483691. The next prime is 18483733. The reversal of 18483721 is 12738481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14930496 + 3553225 = 3864^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 18483721 - 2⁹ = 18483209 is a prime.

It is not a weakly prime, because it can be changed into another prime (18483761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9241860 + 9241861.

It is an arithmetic number, because the mean of its divisors is an integer number (9241861).

Almost surely, 2^18483721 is an apocalyptic number.

It is an amenable number.

18483721 is a deficient number, since it is larger than the sum of its proper divisors (1).

18483721 is an equidigital number, since it uses as much as digits as its factorization.

18483721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 18483721 is about 4299.2698217255. The cubic root of 18483721 is about 264.4010252386.

The spelling of 18483721 in words is "eighteen million, four hundred eighty-three thousand, seven hundred twenty-one".