19677919 has 2 divisors, whose sum is σ = 19677920. Its totient is φ = 19677918.

The previous prime is 19677907. The next prime is 19677947. The reversal of 19677919 is 91977691.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19677919 - 2⁵ = 19677887 is a prime.

It is a super-2 number, since 2×19677919² = 774440992341122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19677019) 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, 9838959 + 9838960.

It is an arithmetic number, because the mean of its divisors is an integer number (9838960).

Almost surely, 2^19677919 is an apocalyptic number.

19677919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19677919 is an equidigital number, since it uses as much as digits as its factorization.

19677919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326, while the sum is 49.

The square root of 19677919 is about 4435.9800495494. The cubic root of 19677919 is about 269.9767652617.

The spelling of 19677919 in words is "nineteen million, six hundred seventy-seven thousand, nine hundred nineteen".