19972197 has 16 divisors (see below), whose sum is σ = 33815680. Its totient is φ = 11412576.

The previous prime is 19972181. The next prime is 19972201. The reversal of 19972197 is 79127991.

It is not a de Polignac number, because 19972197 - 2⁴ = 19972181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52648 + ... + 53025.

It is an arithmetic number, because the mean of its divisors is an integer number (2113480).

Almost surely, 2^19972197 is an apocalyptic number.

It is an amenable number.

19972197 is a deficient number, since it is larger than the sum of its proper divisors (13843483).

19972197 is a wasteful number, since it uses less digits than its factorization.

19972197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105689 (or 105683 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 19972197 is about 4469.0264040393. The cubic root of 19972197 is about 271.3159217410.

The spelling of 19972197 in words is "nineteen million, nine hundred seventy-two thousand, one hundred ninety-seven".