19454989 has 2 divisors, whose sum is σ = 19454990. Its totient is φ = 19454988.

The previous prime is 19454983. The next prime is 19455013. The reversal of 19454989 is 98945491.

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., 19448100 + 6889 = 4410^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 19454989 - 2⁷ = 19454861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19454983) 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, 9727494 + 9727495.

It is an arithmetic number, because the mean of its divisors is an integer number (9727495).

Almost surely, 2^19454989 is an apocalyptic number.

It is an amenable number.

19454989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19454989 is an equidigital number, since it uses as much as digits as its factorization.

19454989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 49.

The square root of 19454989 is about 4410.7809966037. The cubic root of 19454989 is about 268.9533738049.

The spelling of 19454989 in words is "nineteen million, four hundred fifty-four thousand, nine hundred eighty-nine".