13991763 has 4 divisors (see below), whose sum is σ = 18655688. Its totient is φ = 9327840.

The previous prime is 13991749. The next prime is 13991767. The reversal of 13991763 is 36719931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36719931 = 3 ⋅12239977.

It is not a de Polignac number, because 13991763 - 2⁶ = 13991699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13991767) 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, 2331958 + ... + 2331963.

It is an arithmetic number, because the mean of its divisors is an integer number (4663922).

Almost surely, 2^13991763 is an apocalyptic number.

13991763 is a deficient number, since it is larger than the sum of its proper divisors (4663925).

13991763 is an equidigital number, since it uses as much as digits as its factorization.

13991763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663924.

The product of its digits is 30618, while the sum is 39.

The square root of 13991763 is about 3740.5565093980. The cubic root of 13991763 is about 240.9669496639.

The spelling of 13991763 in words is "thirteen million, nine hundred ninety-one thousand, seven hundred sixty-three".