1866249 has 24 divisors (see below), whose sum is σ = 3362112. Its totient is φ = 969120.

The previous prime is 1866247. The next prime is 1866251. The reversal of 1866249 is 9426681.

It is an interprime number because it is at equal distance from previous prime (1866247) and next prime (1866251).

It is not a de Polignac number, because 1866249 - 2¹ = 1866247 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1866247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 654 + ... + 2039.

It is an arithmetic number, because the mean of its divisors is an integer number (140088).

2^1866249 is an apocalyptic number.

It is an amenable number.

1866249 is a deficient number, since it is larger than the sum of its proper divisors (1495863).

1866249 is a wasteful number, since it uses less digits than its factorization.

1866249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717 (or 2714 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1866249 is about 1366.1072432280. The cubic root of 1866249 is about 123.1184660743.

It can be divided in two parts, 186624 and 9, that multiplied together give a 8-th power (1679616 = 6⁸).

The spelling of 1866249 in words is "one million, eight hundred sixty-six thousand, two hundred forty-nine".