18764461 has 2 divisors, whose sum is σ = 18764462. Its totient is φ = 18764460.

The previous prime is 18764443. The next prime is 18764467. The reversal of 18764461 is 16446781.

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., 13616100 + 5148361 = 3690^2 + 2269^2 .

It is a cyclic number.

It is not a de Polignac number, because 18764461 - 2¹⁵ = 18731693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18764461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18764467) 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, 9382230 + 9382231.

It is an arithmetic number, because the mean of its divisors is an integer number (9382231).

Almost surely, 2^18764461 is an apocalyptic number.

It is an amenable number.

18764461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18764461 is an equidigital number, since it uses as much as digits as its factorization.

18764461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 18764461 is about 4331.7965095327. The cubic root of 18764461 is about 265.7329229917.

The spelling of 18764461 in words is "eighteen million, seven hundred sixty-four thousand, four hundred sixty-one".