6439285 has 4 divisors (see below), whose sum is σ = 7727148. Its totient is φ = 5151424.

The previous prime is 6439273. The next prime is 6439291. The reversal of 6439285 is 5829346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5829346 = 2 ⋅2914673.

It can be written as a sum of positive squares in 2 ways, for example, as 2187441 + 4251844 = 1479^2 + 2062^2 .

It is a cyclic number.

It is not a de Polignac number, because 6439285 - 2¹³ = 6431093 is a prime.

It is a super-2 number, since 2×6439285² = 82928782622450, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643924 + ... + 643933.

It is an arithmetic number, because the mean of its divisors is an integer number (1931787).

Almost surely, 2^6439285 is an apocalyptic number.

It is an amenable number.

6439285 is a deficient number, since it is larger than the sum of its proper divisors (1287863).

6439285 is a wasteful number, since it uses less digits than its factorization.

6439285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287862.

The product of its digits is 51840, while the sum is 37.

The square root of 6439285 is about 2537.5746294444. The cubic root of 6439285 is about 186.0426637401.

It can be divided in two parts, 6439 and 285, that added together give a square (6724 = 82²).

The spelling of 6439285 in words is "six million, four hundred thirty-nine thousand, two hundred eighty-five".