19900697 has 2 divisors, whose sum is σ = 19900698. Its totient is φ = 19900696.

The previous prime is 19900691. The next prime is 19900711. The reversal of 19900697 is 79600991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 4682896 = 3901^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 19900697 - 2⁶ = 19900633 is a prime.

It is not a weakly prime, because it can be changed into another prime (19900691) 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, 9950348 + 9950349.

It is an arithmetic number, because the mean of its divisors is an integer number (9950349).

Almost surely, 2^19900697 is an apocalyptic number.

It is an amenable number.

19900697 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900697 is an equidigital number, since it uses as much as digits as its factorization.

19900697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 19900697 is about 4461.0197264751. The cubic root of 19900697 is about 270.9917663834.

The spelling of 19900697 in words is "nineteen million, nine hundred thousand, six hundred ninety-seven".