2155973 has 4 divisors (see below), whose sum is σ = 2164620. Its totient is φ = 2147328.

The previous prime is 2155963. The next prime is 2155999. The reversal of 2155973 is 3795512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2024929 + 131044 = 1423^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155973 - 2⁸ = 2155717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3938 + ... + 4451.

It is an arithmetic number, because the mean of its divisors is an integer number (541155).

2^2155973 is an apocalyptic number.

It is an amenable number.

2155973 is a deficient number, since it is larger than the sum of its proper divisors (8647).

2155973 is an equidigital number, since it uses as much as digits as its factorization.

2155973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8646.

The product of its digits is 9450, while the sum is 32.

The square root of 2155973 is about 1468.3231933059. The cubic root of 2155973 is about 129.1856989414.

The spelling of 2155973 in words is "two million, one hundred fifty-five thousand, nine hundred seventy-three".