137987 has 4 divisors (see below), whose sum is σ = 141240. Its totient is φ = 134736.

The previous prime is 137983. The next prime is 137993. The reversal of 137987 is 789731.

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 137987 - 2² = 137983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1562 + ... + 1647.

It is an arithmetic number, because the mean of its divisors is an integer number (35310).

2¹³⁷⁹⁸⁷ is an apocalyptic number.

137987 is a deficient number, since it is larger than the sum of its proper divisors (3253).

137987 is an equidigital number, since it uses as much as digits as its factorization.

137987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its digits is 10584, while the sum is 35.

The square root of 137987 is about 371.4660145962. The cubic root of 137987 is about 51.6748697809.

It can be divided in two parts, 13 and 7987, that added together give a cube (8000 = 20³).

The spelling of 137987 in words is "one hundred thirty-seven thousand, nine hundred eighty-seven".