6404869 has 4 divisors (see below), whose sum is σ = 6781644. Its totient is φ = 6028096.

The previous prime is 6404837. The next prime is 6404873. The reversal of 6404869 is 9684046.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5116644 + 1288225 = 2262^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404869 - 2⁵ = 6404837 is a prime.

It is a super-2 number, since 2×6404869² = 82044693814322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

6404869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188362 + ... + 188395.

It is an arithmetic number, because the mean of its divisors is an integer number (1695411).

Almost surely, 2^6404869 is an apocalyptic number.

It is an amenable number.

6404869 is a deficient number, since it is larger than the sum of its proper divisors (376775).

6404869 is a wasteful number, since it uses less digits than its factorization.

6404869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376774.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 6404869 is about 2530.7842657959. The cubic root of 6404869 is about 185.7106245263.

The spelling of 6404869 in words is "six million, four hundred four thousand, eight hundred sixty-nine".