2197861 has 8 divisors (see below), whose sum is σ = 2271744. Its totient is φ = 2125200.

The previous prime is 2197849. The next prime is 2197873. The reversal of 2197861 is 1687912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2197849) and next prime (2197873).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2197861 - 2⁷ = 2197733 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2197361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4516 + ... + 4978.

It is an arithmetic number, because the mean of its divisors is an integer number (283968).

2^2197861 is an apocalyptic number.

It is an amenable number.

2197861 is a deficient number, since it is larger than the sum of its proper divisors (73883).

2197861 is a wasteful number, since it uses less digits than its factorization.

2197861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

The product of its digits is 6048, while the sum is 34.

The square root of 2197861 is about 1482.5184653150. The cubic root of 2197861 is about 130.0169800306.

The spelling of 2197861 in words is "two million, one hundred ninety-seven thousand, eight hundred sixty-one".