17940197 has 4 divisors (see below), whose sum is σ = 19571136. Its totient is φ = 16309260.

The previous prime is 17940193. The next prime is 17940203. The reversal of 17940197 is 79104971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 17940197 - 2² = 17940193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17940197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17940193) 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, 815453 + ... + 815474.

It is an arithmetic number, because the mean of its divisors is an integer number (4892784).

Almost surely, 2^17940197 is an apocalyptic number.

It is an amenable number.

17940197 is a deficient number, since it is larger than the sum of its proper divisors (1630939).

17940197 is a wasteful number, since it uses less digits than its factorization.

17940197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630938.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 17940197 is about 4235.5869723097. The cubic root of 17940197 is about 261.7835799962.

The spelling of 17940197 in words is "seventeen million, nine hundred forty thousand, one hundred ninety-seven".