6404285 has 4 divisors (see below), whose sum is σ = 7685148. Its totient is φ = 5123424.

The previous prime is 6404269. The next prime is 6404297. The reversal of 6404285 is 5824046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5824046 = 2 ⋅2912023.

It can be written as a sum of positive squares in 2 ways, for example, as 994009 + 5410276 = 997^2 + 2326^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404285 - 2⁴ = 6404269 is a prime.

It is a super-2 number, since 2×6404285² = 82029732722450, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁶ + 4⁸ + 0 + 4¹¹ + 2²¹ + 8³ + 5³ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 640424 + ... + 640433.

It is an arithmetic number, because the mean of its divisors is an integer number (1921287).

Almost surely, 2^6404285 is an apocalyptic number.

It is an amenable number.

6404285 is a deficient number, since it is larger than the sum of its proper divisors (1280863).

6404285 is a wasteful number, since it uses less digits than its factorization.

6404285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280862.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 6404285 is about 2530.6688839119. The cubic root of 6404285 is about 185.7049799507.

The spelling of 6404285 in words is "six million, four hundred four thousand, two hundred eighty-five".