13991306 has 16 divisors (see below), whose sum is σ = 25396416. Its totient is φ = 5643456.

The previous prime is 13991303. The next prime is 13991309. The reversal of 13991306 is 60319931.

It is an interprime number because it is at equal distance from previous prime (13991303) and next prime (13991309).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13991303) 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, 29156 + ... + 29631.

It is an arithmetic number, because the mean of its divisors is an integer number (1587276).

Almost surely, 2^13991306 is an apocalyptic number.

13991306 is a deficient number, since it is larger than the sum of its proper divisors (11405110).

13991306 is a wasteful number, since it uses less digits than its factorization.

13991306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58813.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 13991306 is about 3740.4954217323. The cubic root of 13991306 is about 240.9643261419.

The spelling of 13991306 in words is "thirteen million, nine hundred ninety-one thousand, three hundred six".