1866344 has 8 divisors (see below), whose sum is σ = 3499410. Its totient is φ = 933168.

The previous prime is 1866343. The next prime is 1866349. The reversal of 1866344 is 4436681.

Added to its reverse (4436681) it gives a triangular number (6303025 = T₃₅₅₀).

It can be written as a sum of positive squares in only one way, i.e., 940900 + 925444 = 970^2 + 962^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1866344.

It is not an unprimeable number, because it can be changed into a prime (1866341) 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 as a sum of consecutive naturals, namely, 116639 + ... + 116654.

2^1866344 is an apocalyptic number.

It is an amenable number.

1866344 is a deficient number, since it is larger than the sum of its proper divisors (1633066).

1866344 is a wasteful number, since it uses less digits than its factorization.

1866344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233299 (or 233295 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 1866344 is about 1366.1420131158. The cubic root of 1866344 is about 123.1205551231.

Adding to 1866344 its reverse (4436681), we get a triangular number (6303025 = T₃₅₅₀).

The spelling of 1866344 in words is "one million, eight hundred sixty-six thousand, three hundred forty-four".