13958991 has 6 divisors (see below), whose sum is σ = 20163000. Its totient is φ = 9305988.

The previous prime is 13958969. The next prime is 13958993. The reversal of 13958991 is 19985931.

It is not a de Polignac number, because 13958991 - 2²² = 9764687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13958993) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 775491 + ... + 775508.

It is an arithmetic number, because the mean of its divisors is an integer number (3360500).

Almost surely, 2^13958991 is an apocalyptic number.

13958991 is a deficient number, since it is larger than the sum of its proper divisors (6204009).

13958991 is a wasteful number, since it uses less digits than its factorization.

13958991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551005 (or 1551002 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 13958991 is about 3736.1733096847. The cubic root of 13958991 is about 240.7786688297.

The spelling of 13958991 in words is "thirteen million, nine hundred fifty-eight thousand, nine hundred ninety-one".