6420015 has 48 divisors (see below), whose sum is σ = 12916800. Its totient is φ = 2889216.

The previous prime is 6419989. The next prime is 6420023. The reversal of 6420015 is 5100246.

It is a happy number.

It is not a de Polignac number, because 6420015 - 2⁵ = 6419983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6420015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27921 + ... + 28149.

It is an arithmetic number, because the mean of its divisors is an integer number (269100).

Almost surely, 2^6420015 is an apocalyptic number.

6420015 is an abundant number, since it is smaller than the sum of its proper divisors (6496785).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6420015 is a wasteful number, since it uses less digits than its factorization.

6420015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 6420015 is about 2533.7748518761. The cubic root of 6420015 is about 185.8568965186.

The spelling of 6420015 in words is "six million, four hundred twenty thousand, fifteen".