6406538 has 8 divisors (see below), whose sum is σ = 9620640. Its totient is φ = 3199660.

The previous prime is 6406529. The next prime is 6406549. The reversal of 6406538 is 8356046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123 + ... + 4161.

It is an arithmetic number, because the mean of its divisors is an integer number (1202580).

Almost surely, 2^6406538 is an apocalyptic number.

6406538 is a deficient number, since it is larger than the sum of its proper divisors (3214102).

6406538 is a wasteful number, since it uses less digits than its factorization.

6406538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6406538 is about 2531.1139839999. The cubic root of 6406538 is about 185.7267541361.

The spelling of 6406538 in words is "six million, four hundred six thousand, five hundred thirty-eight".