1866943 has 6 divisors (see below), whose sum is σ = 2021784. Its totient is φ = 1723176.

The previous prime is 1866941. The next prime is 1866961. The reversal of 1866943 is 3496681.

It is not a de Polignac number, because 1866943 - 2¹ = 1866941 is a prime.

It is a Duffinian number.

1866943 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5355 + ... + 5692.

It is an arithmetic number, because the mean of its divisors is an integer number (336964).

2^1866943 is an apocalyptic number.

1866943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1866943 is a deficient number, since it is larger than the sum of its proper divisors (154841).

1866943 is a wasteful number, since it uses less digits than its factorization.

1866943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11073 (or 11060 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 1866943 is about 1366.3612260307. The cubic root of 1866943 is about 123.1337254933.

It can be divided in two parts, 1866 and 943, that added together give a square (2809 = 53²).

The spelling of 1866943 in words is "one million, eight hundred sixty-six thousand, nine hundred forty-three".