840213 has 40 divisors (see below), whose sum is σ = 1463616. Its totient is φ = 475200.

The previous prime is 840197. The next prime is 840223. The reversal of 840213 is 312048.

It is a happy number.

It is not a de Polignac number, because 840213 - 2⁴ = 840197 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840223) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20473 + ... + 20513.

2⁸⁴⁰²¹³ is an apocalyptic number.

It is an amenable number.

840213 is a deficient number, since it is larger than the sum of its proper divisors (623403).

840213 is a wasteful number, since it uses less digits than its factorization.

840213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 840213 is about 916.6313326523. The cubic root of 840213 is about 94.3618540817.

The spelling of 840213 in words is "eight hundred forty thousand, two hundred thirteen".