6406537 has 4 divisors (see below), whose sum is σ = 6562836. Its totient is φ = 6250240.

The previous prime is 6406529. The next prime is 6406549. The reversal of 6406537 is 7356046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7356046 = 2 ⋅3678023.

It can be written as a sum of positive squares in 2 ways, for example, as 335241 + 6071296 = 579^2 + 2464^2 .

It is a cyclic number.

It is not a de Polignac number, because 6406537 - 2³ = 6406529 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

6406537 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6406499 and 6406508.

It is not an unprimeable number, because it can be changed into a prime (6406507) 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, 78088 + ... + 78169.

It is an arithmetic number, because the mean of its divisors is an integer number (1640709).

Almost surely, 2^6406537 is an apocalyptic number.

It is an amenable number.

6406537 is a deficient number, since it is larger than the sum of its proper divisors (156299).

6406537 is a wasteful number, since it uses less digits than its factorization.

6406537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156298.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 6406537 is about 2531.1137864584. The cubic root of 6406537 is about 185.7267444727.

The spelling of 6406537 in words is "six million, four hundred six thousand, five hundred thirty-seven".