11145540 has 144 divisors (see below), whose sum is σ = 38610432. Its totient is φ = 2386944.

The previous prime is 11145539. The next prime is 11145551. The reversal of 11145540 is 4554111.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a zygodrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49869 + ... + 50091.

It is an arithmetic number, because the mean of its divisors is an integer number (268128).

Almost surely, 2^11145540 is an apocalyptic number.

11145540 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 11145540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19305216).

11145540 is an abundant number, since it is smaller than the sum of its proper divisors (27464892).

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

11145540 is a wasteful number, since it uses less digits than its factorization.

11145540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 257 counting only the distinct ones).

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

The square root of 11145540 is about 3338.4936723019. The cubic root of 11145540 is about 223.3745573762.

Adding to 11145540 its reverse (4554111), we get a palindrome (15699651).

The spelling of 11145540 in words is "eleven million, one hundred forty-five thousand, five hundred forty".