6406987 has 12 divisors (see below), whose sum is σ = 6792120. Its totient is φ = 6041280.

The previous prime is 6406973. The next prime is 6406997. The reversal of 6406987 is 7896046.

It is not a de Polignac number, because 6406987 - 2¹⁵ = 6374219 is a prime.

It is an Ulam number.

It is a Duffinian number.

6406987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6406937) 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 11 ways as a sum of consecutive naturals, for example, 56643 + ... + 56755.

It is an arithmetic number, because the mean of its divisors is an integer number (566010).

Almost surely, 2^6406987 is an apocalyptic number.

6406987 is a deficient number, since it is larger than the sum of its proper divisors (385133).

6406987 is a wasteful number, since it uses less digits than its factorization.

6406987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 6406987 is about 2531.2026785700. The cubic root of 6406987 is about 185.7310928999.

The spelling of 6406987 in words is "six million, four hundred six thousand, nine hundred eighty-seven".