19878983 has 2 divisors, whose sum is σ = 19878984. Its totient is φ = 19878982.

The previous prime is 19878941. The next prime is 19879003. The reversal of 19878983 is 38987891.

It is a strong prime.

It is an emirp because it is prime and its reverse (38987891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19878983 - 2⁶ = 19878919 is a prime.

It is a super-2 number, since 2×19878983² = 790347930228578, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19878913) 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, 9939491 + 9939492.

It is an arithmetic number, because the mean of its divisors is an integer number (9939492).

Almost surely, 2^19878983 is an apocalyptic number.

19878983 is a deficient number, since it is larger than the sum of its proper divisors (1).

19878983 is an equidigital number, since it uses as much as digits as its factorization.

19878983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 19878983 is about 4458.5853137514. The cubic root of 19878983 is about 270.8931692225.

The spelling of 19878983 in words is "nineteen million, eight hundred seventy-eight thousand, nine hundred eighty-three".