6406516 has 6 divisors (see below), whose sum is σ = 11211410. Its totient is φ = 3203256.

The previous prime is 6406507. The next prime is 6406529. The reversal of 6406516 is 6156046.

It can be written as a sum of positive squares in only one way, i.e., 6022116 + 384400 = 2454^2 + 620^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800811 + ... + 800818.

Almost surely, 2^6406516 is an apocalyptic number.

It is an amenable number.

6406516 is a deficient number, since it is larger than the sum of its proper divisors (4804894).

6406516 is a wasteful number, since it uses less digits than its factorization.

6406516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601633 (or 1601631 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6406516 is about 2531.1096380837. The cubic root of 6406516 is about 185.7265415411.

The spelling of 6406516 in words is "six million, four hundred six thousand, five hundred sixteen".