6651396 has 42 divisors (see below), whose sum is σ = 17459582. Its totient is φ = 2216160.

The previous prime is 6651377. The next prime is 6651397. The reversal of 6651396 is 6931566.

It can be written as a sum of positive squares in only one way, i.e., 5904900 + 746496 = 2430^2 + 864^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6651396.

It is not an unprimeable number, because it can be changed into a prime (6651397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1776 + ... + 4056.

Almost surely, 2^6651396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6651396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8729791).

6651396 is an abundant number, since it is smaller than the sum of its proper divisors (10808186).

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

6651396 is a wasteful number, since it uses less digits than its factorization.

6651396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303 (or 2286 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 6651396 is about 2579.0300502321. The cubic root of 6651396 is about 188.0633934396.

The spelling of 6651396 in words is "six million, six hundred fifty-one thousand, three hundred ninety-six".