6400530 has 72 divisors (see below), whose sum is σ = 17652492. Its totient is φ = 1608768.

The previous prime is 6400489. The next prime is 6400531. The reversal of 6400530 is 350046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6007401 + 393129 = 2451^2 + 627^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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 35 ways as a sum of consecutive naturals, for example, 32392 + ... + 32588.

Almost surely, 2^6400530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6400530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8826246).

6400530 is an abundant number, since it is smaller than the sum of its proper divisors (11251962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6400530 is a wasteful number, since it uses less digits than its factorization.

6400530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 6400530 is about 2529.9268764136. The cubic root of 6400530 is about 185.6686782907.

Adding to 6400530 its reverse (350046), we get a palindrome (6750576).

The spelling of 6400530 in words is "six million, four hundred thousand, five hundred thirty".