2155886 has 4 divisors (see below), whose sum is σ = 3233832. Its totient is φ = 1077942.

The previous prime is 2155883. The next prime is 2155931. The reversal of 2155886 is 6885512.

It is a happy number.

2155886 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538970 + ... + 538973.

It is an arithmetic number, because the mean of its divisors is an integer number (808458).

2^2155886 is an apocalyptic number.

2155886 is a deficient number, since it is larger than the sum of its proper divisors (1077946).

2155886 is a wasteful number, since it uses less digits than its factorization.

2155886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077945.

The product of its digits is 19200, while the sum is 35.

The square root of 2155886 is about 1468.2935673768. The cubic root of 2155886 is about 129.1839612407.

The spelling of 2155886 in words is "two million, one hundred fifty-five thousand, eight hundred eighty-six".