137687843 has 4 divisors (see below), whose sum is σ = 137932968. Its totient is φ = 137442720.

The previous prime is 137687773. The next prime is 137687857. The reversal of 137687843 is 348786731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 137687843 - 2¹⁰ = 137686819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137687873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121718 + ... + 122843.

It is an arithmetic number, because the mean of its divisors is an integer number (34483242).

Almost surely, 2^137687843 is an apocalyptic number.

137687843 is a deficient number, since it is larger than the sum of its proper divisors (245125).

137687843 is an equidigital number, since it uses as much as digits as its factorization.

137687843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245124.

The product of its digits is 677376, while the sum is 47.

The square root of 137687843 is about 11734.0463182996. The cubic root of 137687843 is about 516.3749890737.

The spelling of 137687843 in words is "one hundred thirty-seven million, six hundred eighty-seven thousand, eight hundred forty-three".