18709963 has 2 divisors, whose sum is σ = 18709964. Its totient is φ = 18709962.

The previous prime is 18709961. The next prime is 18709993. The reversal of 18709963 is 36990781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18709963 - 2¹ = 18709961 is a prime.

It is a super-2 number, since 2×18709963² = 700125430922738, which contains 22 as substring.

Together with 18709961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18709961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354981 + 9354982.

It is an arithmetic number, because the mean of its divisors is an integer number (9354982).

Almost surely, 2^18709963 is an apocalyptic number.

18709963 is a deficient number, since it is larger than the sum of its proper divisors (1).

18709963 is an equidigital number, since it uses as much as digits as its factorization.

18709963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18709963 is about 4325.5014738178. The cubic root of 18709963 is about 265.4754157188.

The spelling of 18709963 in words is "eighteen million, seven hundred nine thousand, nine hundred sixty-three".