19797897 has 16 divisors (see below), whose sum is σ = 30620672. Its totient is φ = 11143440.

The previous prime is 19797893. The next prime is 19797901. The reversal of 19797897 is 79879791.

It is an interprime number because it is at equal distance from previous prime (19797893) and next prime (19797901).

It is not a de Polignac number, because 19797897 - 2² = 19797893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19797893) 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, 5629 + ... + 8442.

It is an arithmetic number, because the mean of its divisors is an integer number (1913792).

Almost surely, 2^19797897 is an apocalyptic number.

It is an amenable number.

19797897 is a deficient number, since it is larger than the sum of its proper divisors (10822775).

19797897 is a wasteful number, since it uses less digits than its factorization.

19797897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14148.

The product of its digits is 2000376, while the sum is 57.

The square root of 19797897 is about 4449.4827789306. The cubic root of 19797897 is about 270.5243445665.

The spelling of 19797897 in words is "nineteen million, seven hundred ninety-seven thousand, eight hundred ninety-seven".