1391944117 has 8 divisors (see below), whose sum is σ = 1440649440. Its totient is φ = 1343286000.

The previous prime is 1391944111. The next prime is 1391944121. The reversal of 1391944117 is 7114491931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391944117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1391944117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391944111) 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, 54618 + ... + 75940.

It is an arithmetic number, because the mean of its divisors is an integer number (180081180).

Almost surely, 2^1391944117 is an apocalyptic number.

It is an amenable number.

1391944117 is a deficient number, since it is larger than the sum of its proper divisors (48705323).

1391944117 is a wasteful number, since it uses less digits than its factorization.

1391944117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23603.

The product of its digits is 27216, while the sum is 40.

The square root of 1391944117 is about 37308.7672940289. The cubic root of 1391944117 is about 1116.5390924677.

The spelling of 1391944117 in words is "one billion, three hundred ninety-one million, nine hundred forty-four thousand, one hundred seventeen".