19378969 has 2 divisors, whose sum is σ = 19378970. Its totient is φ = 19378968.

The previous prime is 19378967. The next prime is 19378987. The reversal of 19378969 is 96987391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14538969 + 4840000 = 3813^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 19378969 - 2¹ = 19378967 is a prime.

It is a super-2 number, since 2×19378969² = 751088879005922, which contains 22 as substring.

Together with 19378967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19378967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9689484 + 9689485.

It is an arithmetic number, because the mean of its divisors is an integer number (9689485).

Almost surely, 2^19378969 is an apocalyptic number.

It is an amenable number.

19378969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19378969 is an equidigital number, since it uses as much as digits as its factorization.

19378969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 19378969 is about 4402.1550404319. The cubic root of 19378969 is about 268.6026064685.

The spelling of 19378969 in words is "nineteen million, three hundred seventy-eight thousand, nine hundred sixty-nine".