1665213 has 8 divisors (see below), whose sum is σ = 2422176. Its totient is φ = 1009200.

The previous prime is 1665211. The next prime is 1665221. The reversal of 1665213 is 3125661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665213 - 2¹ = 1665211 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 (1665211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25198 + ... + 25263.

It is an arithmetic number, because the mean of its divisors is an integer number (302772).

2^1665213 is an apocalyptic number.

It is an amenable number.

1665213 is a deficient number, since it is larger than the sum of its proper divisors (756963).

1665213 is a wasteful number, since it uses less digits than its factorization.

1665213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50475.

The product of its digits is 1080, while the sum is 24.

The square root of 1665213 is about 1290.4313232404. The cubic root of 1665213 is about 118.5286298749.

The spelling of 1665213 in words is "one million, six hundred sixty-five thousand, two hundred thirteen".