2191626 has 24 divisors (see below), whose sum is σ = 4775940. Its totient is φ = 726336.

The previous prime is 2191619. The next prime is 2191627. The reversal of 2191626 is 6261912.

It can be written as a sum of positive squares in 2 ways, for example, as 1703025 + 488601 = 1305^2 + 699^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 2191626.

It is not an unprimeable number, because it can be changed into a prime (2191627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5440 + ... + 5828.

2^2191626 is an apocalyptic number.

2191626 is an abundant number, since it is smaller than the sum of its proper divisors (2584314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191626 is a wasteful number, since it uses less digits than its factorization.

2191626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 707 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2191626 is about 1480.4141312484. The cubic root of 2191626 is about 129.8939174028.

The spelling of 2191626 in words is "two million, one hundred ninety-one thousand, six hundred twenty-six".