13989491 has 8 divisors (see below), whose sum is σ = 15069120. Its totient is φ = 12944232.

The previous prime is 13989473. The next prime is 13989523. The reversal of 13989491 is 19498931.

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

It is a cyclic number.

It is not a de Polignac number, because 13989491 - 2⁶ = 13989427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13989421) 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, 7745 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (1883640).

Almost surely, 2^13989491 is an apocalyptic number.

13989491 is a deficient number, since it is larger than the sum of its proper divisors (1079629).

13989491 is a wasteful number, since it uses less digits than its factorization.

13989491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17185.

The product of its digits is 69984, while the sum is 44.

The square root of 13989491 is about 3740.2527989429. The cubic root of 13989491 is about 240.9539061195.

The spelling of 13989491 in words is "thirteen million, nine hundred eighty-nine thousand, four hundred ninety-one".