11155540 has 24 divisors (see below), whose sum is σ = 25556832. Its totient is φ = 4056480.

The previous prime is 11155513. The next prime is 11155541. The reversal of 11155540 is 4555111.

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 not an unprimeable number, because it can be changed into a prime (11155541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25134 + ... + 25573.

It is an arithmetic number, because the mean of its divisors is an integer number (1064868).

Almost surely, 2^11155540 is an apocalyptic number.

11155540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11155540 is an abundant number, since it is smaller than the sum of its proper divisors (14401292).

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

11155540 is a wasteful number, since it uses less digits than its factorization.

11155540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50727 (or 50725 counting only the distinct ones).

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

The square root of 11155540 is about 3339.9910179520. The cubic root of 11155540 is about 223.4413427706.

It can be divided in two parts, 11 and 155540, that added together give a palindrome (155551).

The spelling of 11155540 in words is "eleven million, one hundred fifty-five thousand, five hundred forty".