13898437789 has 4 divisors (see below), whose sum is σ = 13899177180. Its totient is φ = 13897698400.

The previous prime is 13898437781. The next prime is 13898437799. The reversal of 13898437789 is 98773489831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8123957689 + 5774480100 = 90133^2 + 75990^2 .

It is a cyclic number.

It is not a de Polignac number, because 13898437789 - 2³ = 13898437781 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 (13898437781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340744 + ... + 379345.

It is an arithmetic number, because the mean of its divisors is an integer number (3474794295).

Almost surely, 2^13898437789 is an apocalyptic number.

It is an amenable number.

13898437789 is a deficient number, since it is larger than the sum of its proper divisors (739391).

13898437789 is an equidigital number, since it uses as much as digits as its factorization.

13898437789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739390.

The product of its digits is 73156608, while the sum is 67.

The spelling of 13898437789 in words is "thirteen billion, eight hundred ninety-eight million, four hundred thirty-seven thousand, seven hundred eighty-nine".