11639540 has 48 divisors (see below), whose sum is σ = 26901504. Its totient is φ = 4195200.

The previous prime is 11639521. The next prime is 11639557. The reversal of 11639540 is 4593611.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41882 + ... + 42158.

It is an arithmetic number, because the mean of its divisors is an integer number (560448).

Almost surely, 2^11639540 is an apocalyptic number.

11639540 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 11639540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13450752).

11639540 is an abundant number, since it is smaller than the sum of its proper divisors (15261964).

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

11639540 is a wasteful number, since it uses less digits than its factorization.

11639540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 11639540 is about 3411.6770069864. The cubic root of 11639540 is about 226.6271509354.

The spelling of 11639540 in words is "eleven million, six hundred thirty-nine thousand, five hundred forty".