1866231 has 12 divisors (see below), whose sum is σ = 2783040. Its totient is φ = 1203840.

The previous prime is 1866223. The next prime is 1866233. The reversal of 1866231 is 1326681.

It is not a de Polignac number, because 1866231 - 2³ = 1866223 is a prime.

It is a super-2 number, since 2×1866231² = 6965636290722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1866195 and 1866204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3066 + ... + 3623.

It is an arithmetic number, because the mean of its divisors is an integer number (231920).

2^1866231 is an apocalyptic number.

1866231 is a deficient number, since it is larger than the sum of its proper divisors (916809).

1866231 is a wasteful number, since it uses less digits than its factorization.

1866231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6726 (or 6723 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1866231 is about 1366.1006551495. The cubic root of 1866231 is about 123.1180702465.

It can be divided in two parts, 186623 and 1, that added together give a square (186624 = 432²).

The spelling of 1866231 in words is "one million, eight hundred sixty-six thousand, two hundred thirty-one".