13403872872387 has 6 divisors (see below), whose sum is σ = 19361149704572. Its totient is φ = 8935915248252.

The previous prime is 13403872872347. The next prime is 13403872872391. The reversal of 13403872872387 is 78327827830431.

It is a happy number.

13403872872387 is a `hidden beast` number, since 1 + 3 + 40 + 3 + 87 + 287 + 238 + 7 = 666.

It is not a de Polignac number, because 13403872872387 - 2⁴⁰ = 12304361244611 is a prime.

It is a super-2 number, since 2×13403872872387² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13403872872317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 744659604013 + ... + 744659604030.

Almost surely, 2^{13403872872387} is an apocalyptic number.

13403872872387 is a deficient number, since it is larger than the sum of its proper divisors (5957276832185).

13403872872387 is a wasteful number, since it uses less digits than its factorization.

13403872872387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489319208049 (or 1489319208046 counting only the distinct ones).

The product of its (nonzero) digits is 75866112, while the sum is 63.

The spelling of 13403872872387 in words is "thirteen trillion, four hundred three billion, eight hundred seventy-two million, eight hundred seventy-two thousand, three hundred eighty-seven".