6400538 has 8 divisors (see below), whose sum is σ = 9616320. Its totient is φ = 3195100.

The previous prime is 6400531. The next prime is 6400543. The reversal of 6400538 is 8350046.

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

It is not an unprimeable number, because it can be changed into a prime (6400531) 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, 788 + ... + 3663.

It is an arithmetic number, because the mean of its divisors is an integer number (1202040).

Almost surely, 2^6400538 is an apocalyptic number.

6400538 is a deficient number, since it is larger than the sum of its proper divisors (3215782).

6400538 is a wasteful number, since it uses less digits than its factorization.

6400538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 6400538 is about 2529.9284574865. The cubic root of 6400538 is about 185.6687556462.

The spelling of 6400538 in words is "six million, four hundred thousand, five hundred thirty-eight".