6406819 has 4 divisors (see below), whose sum is σ = 6744040. Its totient is φ = 6069600.

The previous prime is 6406793. The next prime is 6406823. The reversal of 6406819 is 9186046.

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

It is a cyclic number.

It is not a de Polignac number, because 6406819 - 2⁵ = 6406787 is a prime.

It is a super-2 number, since 2×6406819² = 82094659397522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6406849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168582 + ... + 168619.

It is an arithmetic number, because the mean of its divisors is an integer number (1686010).

Almost surely, 2^6406819 is an apocalyptic number.

6406819 is a deficient number, since it is larger than the sum of its proper divisors (337221).

6406819 is a wasteful number, since it uses less digits than its factorization.

6406819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337220.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 6406819 is about 2531.1694925469. The cubic root of 6406819 is about 185.7294695109.

It can be divided in two parts, 6406 and 819, that added together give a square (7225 = 85²).

The spelling of 6406819 in words is "six million, four hundred six thousand, eight hundred nineteen".