11640043 has 4 divisors (see below), whose sum is σ = 11770920. Its totient is φ = 11509168.

The previous prime is 11640007. The next prime is 11640061. The reversal of 11640043 is 34004611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34004611 = 97 ⋅350563.

It is a cyclic number.

It is not a de Polignac number, because 11640043 - 2¹⁷ = 11508971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11640043.

It is not an unprimeable number, because it can be changed into a prime (11640943) 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, 65305 + ... + 65482.

It is an arithmetic number, because the mean of its divisors is an integer number (2942730).

Almost surely, 2^11640043 is an apocalyptic number.

11640043 is a deficient number, since it is larger than the sum of its proper divisors (130877).

11640043 is an equidigital number, since it uses as much as digits as its factorization.

11640043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130876.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 11640043 is about 3411.7507236022. The cubic root of 11640043 is about 226.6304154348.

Adding to 11640043 its reverse (34004611), we get a palindrome (45644654).

The spelling of 11640043 in words is "eleven million, six hundred forty thousand, forty-three".