11155640 has 16 divisors (see below), whose sum is σ = 25100280. Its totient is φ = 4462240.

The previous prime is 11155637. The next prime is 11155643. The reversal of 11155640 is 4655111.

It is an interprime number because it is at equal distance from previous prime (11155637) and next prime (11155643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139406 + ... + 139485.

Almost surely, 2^11155640 is an apocalyptic number.

11155640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11155640 is an abundant number, since it is smaller than the sum of its proper divisors (13944640).

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

11155640 is a wasteful number, since it uses less digits than its factorization.

11155640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278902 (or 278898 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 11155640 is about 3340.0059880186. The cubic root of 11155640 is about 223.4420104229.

The spelling of 11155640 in words is "eleven million, one hundred fifty-five thousand, six hundred forty".