18626473 has 2 divisors, whose sum is σ = 18626474. Its totient is φ = 18626472.

The previous prime is 18626471. The next prime is 18626507. The reversal of 18626473 is 37462681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 205209 = 4292^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 18626473 - 2¹ = 18626471 is a prime.

Together with 18626471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18626471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9313236 + 9313237.

It is an arithmetic number, because the mean of its divisors is an integer number (9313237).

Almost surely, 2^18626473 is an apocalyptic number.

It is an amenable number.

18626473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18626473 is an equidigital number, since it uses as much as digits as its factorization.

18626473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 18626473 is about 4315.8397792318. The cubic root of 18626473 is about 265.0799473985.

The spelling of 18626473 in words is "eighteen million, six hundred twenty-six thousand, four hundred seventy-three".