19873913 has 2 divisors, whose sum is σ = 19873914. Its totient is φ = 19873912.

The previous prime is 19873891. The next prime is 19873933. The reversal of 19873913 is 31937891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19254544 + 619369 = 4388^2 + 787^2 .

It is a cyclic number.

It is not a de Polignac number, because 19873913 - 2⁸ = 19873657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19873933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9936956 + 9936957.

It is an arithmetic number, because the mean of its divisors is an integer number (9936957).

Almost surely, 2^19873913 is an apocalyptic number.

It is an amenable number.

19873913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19873913 is an equidigital number, since it uses as much as digits as its factorization.

19873913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 19873913 is about 4458.0167114985. The cubic root of 19873913 is about 270.8701374415.

The spelling of 19873913 in words is "nineteen million, eight hundred seventy-three thousand, nine hundred thirteen".