6816406 has 4 divisors (see below), whose sum is σ = 10224612. Its totient is φ = 3408202.

The previous prime is 6816401. The next prime is 6816413. The reversal of 6816406 is 6046186.

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

It is an Ulam number.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6816401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1704100 + ... + 1704103.

It is an arithmetic number, because the mean of its divisors is an integer number (2556153).

Almost surely, 2^6816406 is an apocalyptic number.

6816406 is a deficient number, since it is larger than the sum of its proper divisors (3408206).

6816406 is a wasteful number, since it uses less digits than its factorization.

6816406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408205.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6816406 is about 2610.8247738981. The cubic root of 6816406 is about 189.6058866647.

The spelling of 6816406 in words is "six million, eight hundred sixteen thousand, four hundred six".