13991646 has 24 divisors (see below), whose sum is σ = 29729880. Its totient is φ = 4388992.

The previous prime is 13991639. The next prime is 13991651. The reversal of 13991646 is 64619931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2301 + ... + 5768.

It is an arithmetic number, because the mean of its divisors is an integer number (1238745).

Almost surely, 2^13991646 is an apocalyptic number.

13991646 is an abundant number, since it is smaller than the sum of its proper divisors (15738234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13991646 is a wasteful number, since it uses less digits than its factorization.

13991646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8108 (or 8091 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 13991646 is about 3740.5408699812. The cubic root of 13991646 is about 240.9662780018.

The spelling of 13991646 in words is "thirteen million, nine hundred ninety-one thousand, six hundred forty-six".