13818431837 has 12 divisors (see below), whose sum is σ = 16377797916. Its totient is φ = 11620889280.

The previous prime is 13818431833. The next prime is 13818431941. The reversal of 13818431837 is 73813481831.

It can be written as a sum of positive squares in 2 ways, for example, as 8612953636 + 5205478201 = 92806^2 + 72149^2 .

It is not a de Polignac number, because 13818431837 - 2² = 13818431833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13818431791 and 13818431800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13818431833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2657864 + ... + 2663057.

It is an arithmetic number, because the mean of its divisors is an integer number (1364816493).

Almost surely, 2^13818431837 is an apocalyptic number.

It is an amenable number.

13818431837 is a deficient number, since it is larger than the sum of its proper divisors (2559366079).

13818431837 is an equidigital number, since it uses as much as digits as its factorization.

13818431837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320988 (or 5320981 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The spelling of 13818431837 in words is "thirteen billion, eight hundred eighteen million, four hundred thirty-one thousand, eight hundred thirty-seven".