13991941 has 4 divisors (see below), whose sum is σ = 14028300. Its totient is φ = 13955584.

The previous prime is 13991933. The next prime is 13991953. The reversal of 13991941 is 14919931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8678916 + 5313025 = 2946^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 13991941 - 2³ = 13991933 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 13991941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13991911) 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, 17596 + ... + 18373.

It is an arithmetic number, because the mean of its divisors is an integer number (3507075).

Almost surely, 2^13991941 is an apocalyptic number.

It is an amenable number.

13991941 is a deficient number, since it is larger than the sum of its proper divisors (36359).

13991941 is an equidigital number, since it uses as much as digits as its factorization.

13991941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36358.

The product of its digits is 8748, while the sum is 37.

The square root of 13991941 is about 3740.5803025734. The cubic root of 13991941 is about 240.9679715016.

The spelling of 13991941 in words is "thirteen million, nine hundred ninety-one thousand, nine hundred forty-one".