13123423443 has 32 divisors (see below), whose sum is σ = 19906082560. Its totient is φ = 7623745920.

The previous prime is 13123423441. The next prime is 13123423451. The reversal of 13123423443 is 34432432131.

It is a happy number.

It is not a de Polignac number, because 13123423443 - 2¹ = 13123423441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13123423443.

It is not an unprimeable number, because it can be changed into a prime (13123423441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178413 + ... + 240993.

It is an arithmetic number, because the mean of its divisors is an integer number (622065080).

Almost surely, 2^13123423443 is an apocalyptic number.

13123423443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13123423443 is a deficient number, since it is larger than the sum of its proper divisors (6782659117).

13123423443 is a wasteful number, since it uses less digits than its factorization.

13123423443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62899.

The product of its digits is 20736, while the sum is 30.

Adding to 13123423443 its reverse (34432432131), we get a palindrome (47555855574).

The spelling of 13123423443 in words is "thirteen billion, one hundred twenty-three million, four hundred twenty-three thousand, four hundred forty-three".