137665 has 8 divisors (see below), whose sum is σ = 180288. Its totient is φ = 100080.

The previous prime is 137659. The next prime is 137699. The reversal of 137665 is 566731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 137665 - 2⁵ = 137633 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1197 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (22536).

2¹³⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

137665 is a deficient number, since it is larger than the sum of its proper divisors (42623).

137665 is a wasteful number, since it uses less digits than its factorization.

137665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519.

The product of its digits is 3780, while the sum is 28.

The square root of 137665 is about 371.0323436036. The cubic root of 137665 is about 51.6346431224.

It can be divided in two parts, 1376 and 65, that added together give a palindrome (1441).

The spelling of 137665 in words is "one hundred thirty-seven thousand, six hundred sixty-five".