6400087 has 4 divisors (see below), whose sum is σ = 6407440. Its totient is φ = 6392736.

The previous prime is 6400033. The next prime is 6400091. The reversal of 6400087 is 7800046.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6400087 is a prime.

It is a super-2 number, since 2×6400087² = 81922227215138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400987) 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, 2163 + ... + 4180.

It is an arithmetic number, because the mean of its divisors is an integer number (1601860).

Almost surely, 2^6400087 is an apocalyptic number.

6400087 is a deficient number, since it is larger than the sum of its proper divisors (7353).

6400087 is a wasteful number, since it uses less digits than its factorization.

6400087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7352.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 6400087 is about 2529.8393229610. The cubic root of 6400087 is about 185.6643946287.

The spelling of 6400087 in words is "six million, four hundred thousand, eighty-seven".