11423991 has 8 divisors (see below), whose sum is σ = 15519600. Its totient is φ = 7472192.

The previous prime is 11423987. The next prime is 11424001. The reversal of 11423991 is 19932411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11423991 - 2² = 11423987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11423911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35766 + ... + 36083.

It is an arithmetic number, because the mean of its divisors is an integer number (1939950).

Almost surely, 2^11423991 is an apocalyptic number.

11423991 is a deficient number, since it is larger than the sum of its proper divisors (4095609).

11423991 is an equidigital number, since it uses as much as digits as its factorization.

11423991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71905.

The product of its digits is 1944, while the sum is 30.

The square root of 11423991 is about 3379.9394964999. The cubic root of 11423991 is about 225.2194796628.

The spelling of 11423991 in words is "eleven million, four hundred twenty-three thousand, nine hundred ninety-one".