1865213 has 16 divisors (see below), whose sum is σ = 2239104. Its totient is φ = 1520640.

The previous prime is 1865203. The next prime is 1865221. The reversal of 1865213 is 3125681.

It is a cyclic number.

It is not a de Polignac number, because 1865213 - 2¹⁰ = 1864189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1865203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19181 + ... + 19277.

It is an arithmetic number, because the mean of its divisors is an integer number (139944).

2^1865213 is an apocalyptic number.

It is an amenable number.

1865213 is a deficient number, since it is larger than the sum of its proper divisors (373891).

1865213 is an equidigital number, since it uses as much as digits as its factorization.

1865213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212.

The product of its digits is 1440, while the sum is 26.

The square root of 1865213 is about 1365.7280109890. The cubic root of 1865213 is about 123.0956798437.

The spelling of 1865213 in words is "one million, eight hundred sixty-five thousand, two hundred thirteen".