11415540 has 48 divisors (see below), whose sum is σ = 32497920. Its totient is φ = 2993280.

The previous prime is 11415539. The next prime is 11415541. The reversal of 11415540 is 4551411.

It is an interprime number because it is at equal distance from previous prime (11415539) and next prime (11415541).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11415541) 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, 2101 + ... + 5219.

It is an arithmetic number, because the mean of its divisors is an integer number (677040).

Almost surely, 2^11415540 is an apocalyptic number.

11415540 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 11415540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16248960).

11415540 is an abundant number, since it is smaller than the sum of its proper divisors (21082380).

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

11415540 is a wasteful number, since it uses less digits than its factorization.

11415540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192 (or 3190 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 11415540 is about 3378.6890949006. The cubic root of 11415540 is about 225.1639299181.

Adding to 11415540 its reverse (4551411), we get a palindrome (15966951).

The spelling of 11415540 in words is "eleven million, four hundred fifteen thousand, five hundred forty".