840315 has 32 divisors (see below), whose sum is σ = 1575936. Its totient is φ = 374400.

The previous prime is 840299. The next prime is 840319. The reversal of 840315 is 513048.

It is not a de Polignac number, because 840315 - 2⁴ = 840299 is a prime.

It is a super-2 number, since 2×840315² = 1412258598450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 840291 and 840300.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840315.

It is not an unprimeable number, because it can be changed into a prime (840319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5490 + ... + 5640.

It is an arithmetic number, because the mean of its divisors is an integer number (49248).

2⁸⁴⁰³¹⁵ is an apocalyptic number.

840315 is a deficient number, since it is larger than the sum of its proper divisors (735621).

840315 is a wasteful number, since it uses less digits than its factorization.

840315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219.

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

The square root of 840315 is about 916.6869694721. The cubic root of 840315 is about 94.3656723673.

The spelling of 840315 in words is "eight hundred forty thousand, three hundred fifteen".