6420006 has 32 divisors (see below), whose sum is σ = 14508000. Its totient is φ = 2103840.

The previous prime is 6419989. The next prime is 6420023. The reversal of 6420006 is 6000246.

It is an interprime number because it is at equal distance from previous prime (6419989) and next prime (6420023).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2320 + ... + 4268.

It is an arithmetic number, because the mean of its divisors is an integer number (453375).

Almost surely, 2^6420006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6420006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7254000).

6420006 is an abundant number, since it is smaller than the sum of its proper divisors (8087994).

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

6420006 is a wasteful number, since it uses less digits than its factorization.

6420006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2015 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 6420006 is about 2533.7730758693. The cubic root of 6420006 is about 185.8568096697.

The spelling of 6420006 in words is "six million, four hundred twenty thousand, six".