18680729 has 2 divisors, whose sum is σ = 18680730. Its totient is φ = 18680728.

The previous prime is 18680723. The next prime is 18680741. The reversal of 18680729 is 92708681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18619225 + 61504 = 4315^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 18680729 - 2¹² = 18676633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18680723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9340364 + 9340365.

It is an arithmetic number, because the mean of its divisors is an integer number (9340365).

Almost surely, 2^18680729 is an apocalyptic number.

It is an amenable number.

18680729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18680729 is an equidigital number, since it uses as much as digits as its factorization.

18680729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 18680729 is about 4322.1208914143. The cubic root of 18680729 is about 265.3370766975.

The spelling of 18680729 in words is "eighteen million, six hundred eighty thousand, seven hundred twenty-nine".