18974629 has 2 divisors, whose sum is σ = 18974630. Its totient is φ = 18974628.

The previous prime is 18974623. The next prime is 18974639. The reversal of 18974629 is 92647981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14265729 + 4708900 = 3777^2 + 2170^2 .

It is an emirp because it is prime and its reverse (92647981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18974629 - 2¹¹ = 18972581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18974623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487314 + 9487315.

It is an arithmetic number, because the mean of its divisors is an integer number (9487315).

Almost surely, 2^18974629 is an apocalyptic number.

It is an amenable number.

18974629 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974629 is an equidigital number, since it uses as much as digits as its factorization.

18974629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 18974629 is about 4355.9877180727. The cubic root of 18974629 is about 266.7213400051.

The spelling of 18974629 in words is "eighteen million, nine hundred seventy-four thousand, six hundred twenty-nine".