6415 has 4 divisors (see below), whose sum is σ = 7704. Its totient is φ = 5128.

The previous prime is 6397. The next prime is 6421. The reversal of 6415 is 5146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6415 - 2⁷ = 6287 is a prime.

It is a Duffinian number.

6415 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637 + ... + 646.

It is an arithmetic number, because the mean of its divisors is an integer number (1926).

2⁶⁴¹⁵ is an apocalyptic number.

6415 is a deficient number, since it is larger than the sum of its proper divisors (1289).

6415 is a wasteful number, since it uses less digits than its factorization.

6415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288.

The product of its digits is 120, while the sum is 16.

The square root of 6415 is about 80.0936951326. The cubic root of 6415 is about 18.5808489823.

It can be divided in two parts, 641 and 5, that added together give a palindrome (646).

The spelling of 6415 in words is "six thousand, four hundred fifteen".