840513 has 8 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 558224.

The previous prime is 840491. The next prime is 840523. The reversal of 840513 is 315048.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840513 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 840513.

It is not an unprimeable number, because it can be changed into a prime (840523) 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, 1231 + ... + 1787.

It is an arithmetic number, because the mean of its divisors is an integer number (140616).

2⁸⁴⁰⁵¹³ is an apocalyptic number.

It is an amenable number.

840513 is a deficient number, since it is larger than the sum of its proper divisors (284415).

840513 is a wasteful number, since it uses less digits than its factorization.

840513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 840513 is about 916.7949607191. The cubic root of 840513 is about 94.3730834516.

The spelling of 840513 in words is "eight hundred forty thousand, five hundred thirteen".