40197 has 4 divisors (see below), whose sum is σ = 53600. Its totient is φ = 26796.

The previous prime is 40193. The next prime is 40213. The reversal of 40197 is 79104.

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 40197 - 2² = 40193 is a prime.

It is a D-number.

It is a Duffinian number.

40197 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6697 + ... + 6702.

It is an arithmetic number, because the mean of its divisors is an integer number (13400).

2⁴⁰¹⁹⁷ is an apocalyptic number.

It is an amenable number.

40197 is a deficient number, since it is larger than the sum of its proper divisors (13403).

40197 is a wasteful number, since it uses less digits than its factorization.

40197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13402.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 40197 is about 200.4918950980. The cubic root of 40197 is about 34.2555712251.

The spelling of 40197 in words is "forty thousand, one hundred ninety-seven".