11399543 has 4 divisors (see below), whose sum is σ = 11476200. Its totient is φ = 11322888.

The previous prime is 11399539. The next prime is 11399551. The reversal of 11399543 is 34599311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34599311 = 59 ⋅586429.

It is a cyclic number.

It is not a de Polignac number, because 11399543 - 2² = 11399539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11399593) 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, 38105 + ... + 38402.

It is an arithmetic number, because the mean of its divisors is an integer number (2869050).

Almost surely, 2^11399543 is an apocalyptic number.

11399543 is a deficient number, since it is larger than the sum of its proper divisors (76657).

11399543 is an equidigital number, since it uses as much as digits as its factorization.

11399543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76656.

The product of its digits is 14580, while the sum is 35.

The square root of 11399543 is about 3376.3209266893. The cubic root of 11399543 is about 225.0587040240.

The spelling of 11399543 in words is "eleven million, three hundred ninety-nine thousand, five hundred forty-three".