2640197 has 4 divisors (see below), whose sum is σ = 3017376. Its totient is φ = 2263020.

The previous prime is 2640181. The next prime is 2640217. The reversal of 2640197 is 7910462.

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 a cyclic number.

It is not a de Polignac number, because 2640197 - 2⁴ = 2640181 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 (2640137) 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, 188579 + ... + 188592.

It is an arithmetic number, because the mean of its divisors is an integer number (754344).

2^2640197 is an apocalyptic number.

It is an amenable number.

2640197 is a deficient number, since it is larger than the sum of its proper divisors (377179).

2640197 is an equidigital number, since it uses as much as digits as its factorization.

2640197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377178.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2640197 is about 1624.8683023556. The cubic root of 2640197 is about 138.2119022758.

The spelling of 2640197 in words is "two million, six hundred forty thousand, one hundred ninety-seven".