2061866 has 4 divisors (see below), whose sum is σ = 3092802. Its totient is φ = 1030932.

The previous prime is 2061847. The next prime is 2061869. The reversal of 2061866 is 6681602.

2061866 = 409² + 410² + ... + 420².

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

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 143641 = 1385^2 + 379^2 .

It is not an unprimeable number, because it can be changed into a prime (2061869) 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 as a sum of consecutive naturals, namely, 515465 + ... + 515468.

2^2061866 is an apocalyptic number.

2061866 is a deficient number, since it is larger than the sum of its proper divisors (1030936).

2061866 is a wasteful number, since it uses less digits than its factorization.

2061866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030935.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 2061866 is about 1435.9199142013. The cubic root of 2061866 is about 127.2780400689.

The spelling of 2061866 in words is "two million, sixty-one thousand, eight hundred sixty-six".