11242640 has 20 divisors (see below), whose sum is σ = 26139324. Its totient is φ = 4497024.

The previous prime is 11242639. The next prime is 11242663. The reversal of 11242640 is 4624211.

It can be written as a sum of positive squares in 2 ways, for example, as 1607824 + 9634816 = 1268^2 + 3104^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70187 + ... + 70346.

Almost surely, 2^11242640 is an apocalyptic number.

11242640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11242640 is an abundant number, since it is smaller than the sum of its proper divisors (14896684).

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

11242640 is a wasteful number, since it uses less digits than its factorization.

11242640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140546 (or 140540 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 11242640 is about 3353.0046227227. The cubic root of 11242640 is about 224.0213627585.

Adding to 11242640 its reverse (4624211), we get a palindrome (15866851).

The spelling of 11242640 in words is "eleven million, two hundred forty-two thousand, six hundred forty".