6642406 has 4 divisors (see below), whose sum is σ = 9963612. Its totient is φ = 3321202.

The previous prime is 6642403. The next prime is 6642409. The reversal of 6642406 is 6042466.

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

It is an interprime number because it is at equal distance from previous prime (6642403) and next prime (6642409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660600 + ... + 1660603.

It is an arithmetic number, because the mean of its divisors is an integer number (2490903).

Almost surely, 2^6642406 is an apocalyptic number.

6642406 is a deficient number, since it is larger than the sum of its proper divisors (3321206).

6642406 is a wasteful number, since it uses less digits than its factorization.

6642406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321205.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 6642406 is about 2577.2865576028. The cubic root of 6642406 is about 187.9786266633.

The spelling of 6642406 in words is "six million, six hundred forty-two thousand, four hundred six".