19798973 has 2 divisors, whose sum is σ = 19798974. Its totient is φ = 19798972.

The previous prime is 19798957. The next prime is 19798981. The reversal of 19798973 is 37989791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10876804 + 8922169 = 3298^2 + 2987^2 .

It is a cyclic number.

It is not a de Polignac number, because 19798973 - 2⁴ = 19798957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19791973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9899486 + 9899487.

It is an arithmetic number, because the mean of its divisors is an integer number (9899487).

Almost surely, 2^19798973 is an apocalyptic number.

It is an amenable number.

19798973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19798973 is an equidigital number, since it uses as much as digits as its factorization.

19798973 is an odious number, because the sum of its binary digits is odd.

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

The square root of 19798973 is about 4449.6036902178. The cubic root of 19798973 is about 270.5292454055.

The spelling of 19798973 in words is "nineteen million, seven hundred ninety-eight thousand, nine hundred seventy-three".