155687 has 8 divisors (see below), whose sum is σ = 185856. Its totient is φ = 127512.

The previous prime is 155671. The next prime is 155689. The reversal of 155687 is 786551.

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

It is not a de Polignac number, because 155687 - 2⁴ = 155671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155689) 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 7 ways as a sum of consecutive naturals, for example, 323 + ... + 644.

It is an arithmetic number, because the mean of its divisors is an integer number (23232).

2¹⁵⁵⁶⁸⁷ is an apocalyptic number.

155687 is a deficient number, since it is larger than the sum of its proper divisors (30169).

155687 is an equidigital number, since it uses as much as digits as its factorization.

155687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997.

The product of its digits is 8400, while the sum is 32.

The square root of 155687 is about 394.5719199335. The cubic root of 155687 is about 53.7960989050.

The spelling of 155687 in words is "one hundred fifty-five thousand, six hundred eighty-seven".