1326644140 has 48 divisors (see below), whose sum is σ = 2911813632. Its totient is φ = 506759616.

The previous prime is 1326644131. The next prime is 1326644141. The reversal of 1326644140 is 414466231.

It is not an unprimeable number, because it can be changed into a prime (1326644141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332437 + ... + 336403.

It is an arithmetic number, because the mean of its divisors is an integer number (60662784).

Almost surely, 2^1326644140 is an apocalyptic number.

1326644140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1326644140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455906816).

1326644140 is an abundant number, since it is smaller than the sum of its proper divisors (1585169492).

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

1326644140 is a wasteful number, since it uses less digits than its factorization.

1326644140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726 (or 4724 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 1326644140 is about 36423.1264446093. The cubic root of 1326644140 is about 1098.7987271756.

The spelling of 1326644140 in words is "one billion, three hundred twenty-six million, six hundred forty-four thousand, one hundred forty".