6406523 has 4 divisors (see below), whose sum is σ = 6542880. Its totient is φ = 6270168.

The previous prime is 6406507. The next prime is 6406529. The reversal of 6406523 is 3256046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6406523 - 2⁴ = 6406507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6406492 and 6406501.

It is not an unprimeable number, because it can be changed into a prime (6406529) 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, 68108 + ... + 68201.

It is an arithmetic number, because the mean of its divisors is an integer number (1635720).

Almost surely, 2^6406523 is an apocalyptic number.

6406523 is a deficient number, since it is larger than the sum of its proper divisors (136357).

6406523 is a wasteful number, since it uses less digits than its factorization.

6406523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136356.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 6406523 is about 2531.1110208760. Note that the first 3 decimals coincide. The cubic root of 6406523 is about 185.7266091850.

The spelling of 6406523 in words is "six million, four hundred six thousand, five hundred twenty-three".