6402006 has 48 divisors (see below), whose sum is σ = 15135120. Its totient is φ = 1944000.

The previous prime is 6402001. The next prime is 6402007. The reversal of 6402006 is 6002046.

6402006 is a `hidden beast` number, since 640 + 20 + 0 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6402006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6402001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25381 + ... + 25631.

It is an arithmetic number, because the mean of its divisors is an integer number (315315).

Almost surely, 2^6402006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6402006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7567560).

6402006 is an abundant number, since it is smaller than the sum of its proper divisors (8733114).

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

6402006 is a wasteful number, since it uses less digits than its factorization.

6402006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 378 counting only the distinct ones).

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

The square root of 6402006 is about 2530.2185676340. The cubic root of 6402006 is about 185.6829492915.

The spelling of 6402006 in words is "six million, four hundred two thousand, six".