11644040 has 16 divisors (see below), whose sum is σ = 26199180. Its totient is φ = 4657600.

The previous prime is 11644037. The next prime is 11644043. The reversal of 11644040 is 4044611.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11644037) and next prime (11644043).

It can be written as a sum of positive squares in 2 ways, for example, as 11437924 + 206116 = 3382^2 + 454^2 .

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

It is not an unprimeable number, because it can be changed into a prime (11644043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145511 + ... + 145590.

Almost surely, 2^11644040 is an apocalyptic number.

11644040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11644040 is an abundant number, since it is smaller than the sum of its proper divisors (14555140).

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

11644040 is a wasteful number, since it uses less digits than its factorization.

11644040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291112 (or 291108 counting only the distinct ones).

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

The square root of 11644040 is about 3412.3364429669. The cubic root of 11644040 is about 226.6563528564.

Adding to 11644040 its reverse (4044611), we get a palindrome (15688651).

The spelling of 11644040 in words is "eleven million, six hundred forty-four thousand, forty".