6439087 has 4 divisors (see below), whose sum is σ = 6469816. Its totient is φ = 6408360.

The previous prime is 6439067. The next prime is 6439123. The reversal of 6439087 is 7809346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7809346 = 2 ⋅3904673.

It is a cyclic number.

It is not a de Polignac number, because 6439087 - 2⁷ = 6438959 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439007) 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, 15048 + ... + 15469.

It is an arithmetic number, because the mean of its divisors is an integer number (1617454).

Almost surely, 2^6439087 is an apocalyptic number.

6439087 is a deficient number, since it is larger than the sum of its proper divisors (30729).

6439087 is a wasteful number, since it uses less digits than its factorization.

6439087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30728.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 6439087 is about 2537.5356155136. The cubic root of 6439087 is about 186.0407568604.

It can be divided in two parts, 643 and 9087, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 6439087 in words is "six million, four hundred thirty-nine thousand, eighty-seven".