13244402391 has 24 divisors (see below), whose sum is σ = 19563436032. Its totient is φ = 7963678800.

The previous prime is 13244402389. The next prime is 13244402419. The reversal of 13244402391 is 19320444231.

It is not a de Polignac number, because 13244402391 - 2¹ = 13244402389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13244402491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97545 + ... + 189746.

It is an arithmetic number, because the mean of its divisors is an integer number (815143168).

Almost surely, 2^13244402391 is an apocalyptic number.

13244402391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13244402391 is a deficient number, since it is larger than the sum of its proper divisors (6319033641).

13244402391 is a wasteful number, since it uses less digits than its factorization.

13244402391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287443 (or 287432 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 13244402391 in words is "thirteen billion, two hundred forty-four million, four hundred two thousand, three hundred ninety-one".