11503979 has 4 divisors (see below), whose sum is σ = 12004176. Its totient is φ = 11003784.

The previous prime is 11503939. The next prime is 11503993. The reversal of 11503979 is 97930511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97930511 = 7 ⋅13990073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11503979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11503939) 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, 250064 + ... + 250109.

It is an arithmetic number, because the mean of its divisors is an integer number (3001044).

Almost surely, 2^11503979 is an apocalyptic number.

11503979 is a deficient number, since it is larger than the sum of its proper divisors (500197).

11503979 is an equidigital number, since it uses as much as digits as its factorization.

11503979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500196.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 11503979 is about 3391.7516123679. The cubic root of 11503979 is about 225.7439015664.

The spelling of 11503979 in words is "eleven million, five hundred three thousand, nine hundred seventy-nine".