18980629 has 2 divisors, whose sum is σ = 18980630. Its totient is φ = 18980628.

The previous prime is 18980617. The next prime is 18980659. The reversal of 18980629 is 92608981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 1214404 = 4215^2 + 1102^2 .

It is an emirp because it is prime and its reverse (92608981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18980629 - 2⁵ = 18980597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18980659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9490314 + 9490315.

It is an arithmetic number, because the mean of its divisors is an integer number (9490315).

Almost surely, 2^18980629 is an apocalyptic number.

It is an amenable number.

18980629 is a deficient number, since it is larger than the sum of its proper divisors (1).

18980629 is an equidigital number, since it uses as much as digits as its factorization.

18980629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 18980629 is about 4356.6763708130. The cubic root of 18980629 is about 266.7494505132.

The spelling of 18980629 in words is "eighteen million, nine hundred eighty thousand, six hundred twenty-nine".