19389889 has 2 divisors, whose sum is σ = 19389890. Its totient is φ = 19389888.

The previous prime is 19389883. The next prime is 19389907. The reversal of 19389889 is 98898391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 5640625 = 3708^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 19389889 - 2⁵ = 19389857 is a prime.

It is not a weakly prime, because it can be changed into another prime (19389883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9694944 + 9694945.

It is an arithmetic number, because the mean of its divisors is an integer number (9694945).

Almost surely, 2^19389889 is an apocalyptic number.

It is an amenable number.

19389889 is a deficient number, since it is larger than the sum of its proper divisors (1).

19389889 is an equidigital number, since it uses as much as digits as its factorization.

19389889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 55.

The square root of 19389889 is about 4403.3951673680. The cubic root of 19389889 is about 268.6530492913.

The spelling of 19389889 in words is "nineteen million, three hundred eighty-nine thousand, eight hundred eighty-nine".