1866313 has 4 divisors (see below), whose sum is σ = 1964560. Its totient is φ = 1768068.

The previous prime is 1866307. The next prime is 1866331. The reversal of 1866313 is 3136681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3136681 = 61 ⋅51421.

It is a cyclic number.

It is not a de Polignac number, because 1866313 - 2⁵ = 1866281 is a prime.

It is an Ulam number.

It is a Duffinian number.

1866313 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1866343) 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 3 ways as a sum of consecutive naturals, for example, 49095 + ... + 49132.

It is an arithmetic number, because the mean of its divisors is an integer number (491140).

2^1866313 is an apocalyptic number.

It is an amenable number.

1866313 is a deficient number, since it is larger than the sum of its proper divisors (98247).

1866313 is an equidigital number, since it uses as much as digits as its factorization.

1866313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98246.

The product of its digits is 2592, while the sum is 28.

The square root of 1866313 is about 1366.1306672497. The cubic root of 1866313 is about 123.1198734413.

The spelling of 1866313 in words is "one million, eight hundred sixty-six thousand, three hundred thirteen".