19797893 has 2 divisors, whose sum is σ = 19797894. Its totient is φ = 19797892.

The previous prime is 19797887. The next prime is 19797901. The reversal of 19797893 is 39879791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 3621409 = 4022^2 + 1903^2 .

It is a cyclic number.

It is not a de Polignac number, because 19797893 - 2¹⁰ = 19796869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19797493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9898946 + 9898947.

It is an arithmetic number, because the mean of its divisors is an integer number (9898947).

Almost surely, 2^19797893 is an apocalyptic number.

It is an amenable number.

19797893 is a deficient number, since it is larger than the sum of its proper divisors (1).

19797893 is an equidigital number, since it uses as much as digits as its factorization.

19797893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 53.

The square root of 19797893 is about 4449.4823294401. The cubic root of 19797893 is about 270.5243263474.

The spelling of 19797893 in words is "nineteen million, seven hundred ninety-seven thousand, eight hundred ninety-three".