2196639 has 20 divisors (see below), whose sum is σ = 3357024. Its totient is φ = 1430784.

The previous prime is 2196619. The next prime is 2196641. The reversal of 2196639 is 9366912.

2196639 is a `hidden beast` number, since 2 + 19 + 6 + 639 = 666.

It is not a de Polignac number, because 2196639 - 2⁹ = 2196127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2196619) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3519 + ... + 4095.

2^2196639 is an apocalyptic number.

2196639 is a deficient number, since it is larger than the sum of its proper divisors (1160385).

2196639 is an equidigital number, since it uses as much as digits as its factorization.

2196639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 627 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 2196639 is about 1482.1062714934. The cubic root of 2196639 is about 129.9928792944.

The spelling of 2196639 in words is "two million, one hundred ninety-six thousand, six hundred thirty-nine".