2127861 has 6 divisors (see below), whose sum is σ = 3073590. Its totient is φ = 1418568.

The previous prime is 2127857. The next prime is 2127883. The reversal of 2127861 is 1687212.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 463761 = 1290^2 + 681^2 .

It is not a de Polignac number, because 2127861 - 2² = 2127857 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2127841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118206 + ... + 118223.

It is an arithmetic number, because the mean of its divisors is an integer number (512265).

2^2127861 is an apocalyptic number.

It is an amenable number.

2127861 is a deficient number, since it is larger than the sum of its proper divisors (945729).

2127861 is a wasteful number, since it uses less digits than its factorization.

2127861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236435 (or 236432 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 2127861 is about 1458.7189585386. The cubic root of 2127861 is about 128.6217512007.

The spelling of 2127861 in words is "two million, one hundred twenty-seven thousand, eight hundred sixty-one".