2197906 has 4 divisors (see below), whose sum is σ = 3296862. Its totient is φ = 1098952.

The previous prime is 2197873. The next prime is 2197907. The reversal of 2197906 is 6097912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2030625 + 167281 = 1425^2 + 409^2 .

It is not an unprimeable number, because it can be changed into a prime (2197907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549475 + ... + 549478.

2^2197906 is an apocalyptic number.

2197906 is a deficient number, since it is larger than the sum of its proper divisors (1098956).

2197906 is a wasteful number, since it uses less digits than its factorization.

2197906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098955.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 2197906 is about 1482.5336421141. The cubic root of 2197906 is about 130.0178673667.

The spelling of 2197906 in words is "two million, one hundred ninety-seven thousand, nine hundred six".