19442197 has 4 divisors (see below), whose sum is σ = 19634796. Its totient is φ = 19249600.

The previous prime is 19442191. The next prime is 19442231. The reversal of 19442197 is 79124491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79124491 = 173 ⋅457367.

It can be written as a sum of positive squares in 2 ways, for example, as 18584721 + 857476 = 4311^2 + 926^2 .

It is a cyclic number.

It is not a de Polignac number, because 19442197 - 2¹¹ = 19440149 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 (19442191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96148 + ... + 96349.

It is an arithmetic number, because the mean of its divisors is an integer number (4908699).

Almost surely, 2^19442197 is an apocalyptic number.

It is an amenable number.

19442197 is a deficient number, since it is larger than the sum of its proper divisors (192599).

19442197 is a wasteful number, since it uses less digits than its factorization.

19442197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192598.

The product of its digits is 18144, while the sum is 37.

The square root of 19442197 is about 4409.3306748304. The cubic root of 19442197 is about 268.8944136775.

The spelling of 19442197 in words is "nineteen million, four hundred forty-two thousand, one hundred ninety-seven".