6400006 has 4 divisors (see below), whose sum is σ = 9600012. Its totient is φ = 3200002.

The previous prime is 6399971. The next prime is 6400013. The reversal of 6400006 is 6000046.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600000 + ... + 1600003.

It is an arithmetic number, because the mean of its divisors is an integer number (2400003).

Almost surely, 2^6400006 is an apocalyptic number.

6400006 is a deficient number, since it is larger than the sum of its proper divisors (3200006).

6400006 is a wasteful number, since it uses less digits than its factorization.

6400006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200005.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 6400006 is about 2529.8233139885. The cubic root of 6400006 is about 185.6636113644.

The spelling of 6400006 in words is "six million, four hundred thousand, six".