18428737 has 2 divisors, whose sum is σ = 18428738. Its totient is φ = 18428736.

The previous prime is 18428719. The next prime is 18428741. The reversal of 18428737 is 73782481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11895601 + 6533136 = 3449^2 + 2556^2 .

It is an emirp because it is prime and its reverse (73782481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18428737 - 2¹⁵ = 18395969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18428737.

It is not a weakly prime, because it can be changed into another prime (18428797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214368 + 9214369.

It is an arithmetic number, because the mean of its divisors is an integer number (9214369).

Almost surely, 2^18428737 is an apocalyptic number.

It is an amenable number.

18428737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428737 is an equidigital number, since it uses as much as digits as its factorization.

18428737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 40.

The square root of 18428737 is about 4292.8704848854. The cubic root of 18428737 is about 264.1385913345.

The spelling of 18428737 in words is "eighteen million, four hundred twenty-eight thousand, seven hundred thirty-seven".