1864213 has 4 divisors (see below), whose sum is σ = 2007628. Its totient is φ = 1720800.

The previous prime is 1864189. The next prime is 1864217. The reversal of 1864213 is 3124681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1077444 + 786769 = 1038^2 + 887^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864213 - 2¹³ = 1856021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71688 + ... + 71713.

It is an arithmetic number, because the mean of its divisors is an integer number (501907).

2^1864213 is an apocalyptic number.

1864213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1864213 is a deficient number, since it is larger than the sum of its proper divisors (143415).

1864213 is a wasteful number, since it uses less digits than its factorization.

1864213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143414.

The product of its digits is 1152, while the sum is 25.

The square root of 1864213 is about 1365.3618567984. The cubic root of 1864213 is about 123.0736774084.

Adding to 1864213 its reverse (3124681), we get a palindrome (4988894).

The spelling of 1864213 in words is "one million, eight hundred sixty-four thousand, two hundred thirteen".