1866266 has 16 divisors (see below), whose sum is σ = 3024000. Its totient is φ = 861168.

The previous prime is 1866251. The next prime is 1866269. The reversal of 1866266 is 6626681.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1866269) 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 in 7 ways as a sum of consecutive naturals, for example, 635 + ... + 2033.

It is an arithmetic number, because the mean of its divisors is an integer number (189000).

2^1866266 is an apocalyptic number.

1866266 is a deficient number, since it is larger than the sum of its proper divisors (1157734).

1866266 is a wasteful number, since it uses less digits than its factorization.

1866266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its digits is 20736, while the sum is 35.

The square root of 1866266 is about 1366.1134652729. The cubic root of 1866266 is about 123.1188399093.

It can be divided in two parts, 186626 and 6, that multiplied together give a triangular number (1119756 = T₁₄₉₆).

The spelling of 1866266 in words is "one million, eight hundred sixty-six thousand, two hundred sixty-six".