387687885173 has 4 divisors (see below), whose sum is σ = 387726306828. Its totient is φ = 387649463520.

The previous prime is 387687885139. The next prime is 387687885271. The reversal of 387687885173 is 371588786783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 371588786783 = 240587 ⋅1544509.

It can be written as a sum of positive squares in 2 ways, for example, as 68590562404 + 319097322769 = 261898^2 + 564887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387687885173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 387687885097 and 387687885106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387687885103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19195688 + ... + 19215873.

It is an arithmetic number, because the mean of its divisors is an integer number (96931576707).

Almost surely, 2^387687885173 is an apocalyptic number.

It is an amenable number.

387687885173 is a deficient number, since it is larger than the sum of its proper divisors (38421655).

387687885173 is a wasteful number, since it uses less digits than its factorization.

387687885173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38421654.

The product of its digits is 379330560, while the sum is 71.

The spelling of 387687885173 in words is "three hundred eighty-seven billion, six hundred eighty-seven million, eight hundred eighty-five thousand, one hundred seventy-three".