2197845 has 54 divisors (see below), whose sum is σ = 4382118. Its totient is φ = 1018368.

The previous prime is 2197799. The next prime is 2197847. The reversal of 2197845 is 5487912.

It can be written as a sum of positive squares in 9 ways, for example, as 617796 + 1580049 = 786^2 + 1257^2 .

It is not a de Polignac number, because 2197845 - 2⁶ = 2197781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2197847) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 129277 + ... + 129293.

2^2197845 is an apocalyptic number.

It is an amenable number.

2197845 is a deficient number, since it is larger than the sum of its proper divisors (2184273).

2197845 is a wasteful number, since it uses less digits than its factorization.

2197845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 38 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2197845 is about 1482.5130690824. The cubic root of 2197845 is about 130.0166645304.

The spelling of 2197845 in words is "two million, one hundred ninety-seven thousand, eight hundred forty-five".