2155847 has 4 divisors (see below), whose sum is σ = 2180160. Its totient is φ = 2131536.

The previous prime is 2155841. The next prime is 2155849. The reversal of 2155847 is 7485512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155847 - 2¹⁴ = 2139463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155841) 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, 12023 + ... + 12200.

It is an arithmetic number, because the mean of its divisors is an integer number (545040).

2^2155847 is an apocalyptic number.

2155847 is a deficient number, since it is larger than the sum of its proper divisors (24313).

2155847 is an equidigital number, since it uses as much as digits as its factorization.

2155847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24312.

The product of its digits is 11200, while the sum is 32.

The square root of 2155847 is about 1468.2802865938. The cubic root of 2155847 is about 129.1831822563.

The spelling of 2155847 in words is "two million, one hundred fifty-five thousand, eight hundred forty-seven".