11551540 has 96 divisors (see below), whose sum is σ = 32626944. Its totient is φ = 3317760.

The previous prime is 11551531. The next prime is 11551559. The reversal of 11551540 is 4515511.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19732 + ... + 20308.

It is an arithmetic number, because the mean of its divisors is an integer number (339864).

Almost surely, 2^11551540 is an apocalyptic number.

11551540 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 11551540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16313472).

11551540 is an abundant number, since it is smaller than the sum of its proper divisors (21075404).

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

11551540 is a wasteful number, since it uses less digits than its factorization.

11551540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 11551540 is about 3398.7556546477. The cubic root of 11551540 is about 226.0545721453.

The spelling of 11551540 in words is "eleven million, five hundred fifty-one thousand, five hundred forty".