18953719 has 2 divisors, whose sum is σ = 18953720. Its totient is φ = 18953718.

The previous prime is 18953717. The next prime is 18953723. The reversal of 18953719 is 91735981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18953719 - 2¹ = 18953717 is a prime.

It is a super-2 number, since 2×18953719² = 718486927861922, which contains 22 as substring.

Together with 18953717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18953717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9476859 + 9476860.

It is an arithmetic number, because the mean of its divisors is an integer number (9476860).

Almost surely, 2^18953719 is an apocalyptic number.

18953719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18953719 is an equidigital number, since it uses as much as digits as its factorization.

18953719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 43.

The square root of 18953719 is about 4353.5869119612. The cubic root of 18953719 is about 266.6233285474.

The spelling of 18953719 in words is "eighteen million, nine hundred fifty-three thousand, seven hundred nineteen".