13403400385 has 4 divisors (see below), whose sum is σ = 16084080468. Its totient is φ = 10722720304.

The previous prime is 13403400349. The next prime is 13403400401. The reversal of 13403400385 is 58300430431.

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 3358550209 + 10044850176 = 57953^2 + 100224^2 .

It is a cyclic number.

It is not a de Polignac number, because 13403400385 - 2²¹ = 13401303233 is a prime.

It is a super-2 number, since 2×13403400385² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340340034 + ... + 1340340043.

It is an arithmetic number, because the mean of its divisors is an integer number (4021020117).

Almost surely, 2^13403400385 is an apocalyptic number.

It is an amenable number.

13403400385 is a deficient number, since it is larger than the sum of its proper divisors (2680680083).

13403400385 is an equidigital number, since it uses as much as digits as its factorization.

13403400385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680680082.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 13403400385 in words is "thirteen billion, four hundred three million, four hundred thousand, three hundred eighty-five".