13991426 has 8 divisors (see below), whose sum is σ = 21475344. Its totient is φ = 6832980.

The previous prime is 13991401. The next prime is 13991441. The reversal of 13991426 is 62419931.

13991426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81260 + ... + 81431.

It is an arithmetic number, because the mean of its divisors is an integer number (2684418).

Almost surely, 2^13991426 is an apocalyptic number.

13991426 is a deficient number, since it is larger than the sum of its proper divisors (7483918).

13991426 is a wasteful number, since it uses less digits than its factorization.

13991426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162736.

The product of its digits is 11664, while the sum is 35.

The square root of 13991426 is about 3740.5114623538. The cubic root of 13991426 is about 240.9650150372.

The spelling of 13991426 in words is "thirteen million, nine hundred ninety-one thousand, four hundred twenty-six".