840613 has 4 divisors (see below), whose sum is σ = 847360. Its totient is φ = 833868.

The previous prime is 840611. The next prime is 840643. The reversal of 840613 is 316048.

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.

It is a cyclic number.

It is not a de Polignac number, because 840613 - 2¹ = 840611 is a prime.

It is a Duffinian number.

840613 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840611) 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, 3183 + ... + 3436.

It is an arithmetic number, because the mean of its divisors is an integer number (211840).

2⁸⁴⁰⁶¹³ is an apocalyptic number.

It is an amenable number.

840613 is a deficient number, since it is larger than the sum of its proper divisors (6747).

840613 is a wasteful number, since it uses less digits than its factorization.

840613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6746.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 840613 is about 916.8494969187. The cubic root of 840613 is about 94.3768259811.

It can be divided in two parts, 8406 and 13, that multiplied together give a triangular number (109278 = T₄₆₇).

The spelling of 840613 in words is "eight hundred forty thousand, six hundred thirteen".