13400726231 has 4 divisors (see below), whose sum is σ = 13446462792. Its totient is φ = 13354989672.

The previous prime is 13400726189. The next prime is 13400726263. The reversal of 13400726231 is 13262700431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13262700431 = 37 ⋅358451363.

It is a cyclic number.

It is not a de Polignac number, because 13400726231 - 2²² = 13396531927 is a prime.

It is a super-2 number, since 2×13400726231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13400726194 and 13400726203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13400726281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22867841 + ... + 22868426.

It is an arithmetic number, because the mean of its divisors is an integer number (3361615698).

Almost surely, 2^13400726231 is an apocalyptic number.

13400726231 is a deficient number, since it is larger than the sum of its proper divisors (45736561).

13400726231 is an equidigital number, since it uses as much as digits as its factorization.

13400726231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45736560.

The product of its (nonzero) digits is 6048, while the sum is 29.

The spelling of 13400726231 in words is "thirteen billion, four hundred million, seven hundred twenty-six thousand, two hundred thirty-one".