13991963 has 4 divisors (see below), whose sum is σ = 14006328. Its totient is φ = 13977600.

The previous prime is 13991953. The next prime is 13991977. The reversal of 13991963 is 36919931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36919931 = 719 ⋅51349.

It is a cyclic number.

It is not a de Polignac number, because 13991963 - 2¹⁶ = 13926427 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 13991963.

It is not an unprimeable number, because it can be changed into a prime (13991933) 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, 5606 + ... + 7707.

It is an arithmetic number, because the mean of its divisors is an integer number (3501582).

Almost surely, 2^13991963 is an apocalyptic number.

13991963 is a deficient number, since it is larger than the sum of its proper divisors (14365).

13991963 is a wasteful number, since it uses less digits than its factorization.

13991963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14364.

The product of its digits is 39366, while the sum is 41.

The square root of 13991963 is about 3740.5832432924. The cubic root of 13991963 is about 240.9680977956.

The spelling of 13991963 in words is "thirteen million, nine hundred ninety-one thousand, nine hundred sixty-three".