13890391623 has 8 divisors (see below), whose sum is σ = 20578358000. Its totient is φ = 9260261064.

The previous prime is 13890391607. The next prime is 13890391631. The reversal of 13890391623 is 32619309831.

13890391623 is a `hidden beast` number, since 13 + 8 + 9 + 0 + 3 + 9 + 1 + 623 = 666.

It is not a de Polignac number, because 13890391623 - 2⁴ = 13890391607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13890391663) 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, 257229448 + ... + 257229501.

It is an arithmetic number, because the mean of its divisors is an integer number (2572294750).

Almost surely, 2^13890391623 is an apocalyptic number.

13890391623 is a deficient number, since it is larger than the sum of its proper divisors (6687966377).

13890391623 is an equidigital number, since it uses as much as digits as its factorization.

13890391623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514458958 (or 514458952 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 13890391623 in words is "thirteen billion, eight hundred ninety million, three hundred ninety-one thousand, six hundred twenty-three".