155647 has 4 divisors (see below), whose sum is σ = 156456. Its totient is φ = 154840.

The previous prime is 155627. The next prime is 155653. The reversal of 155647 is 746551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 746551 = 13 ⋅57427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155647 is a prime.

It is a Duffinian number.

155647 is a lucky number.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155627) 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, 72 + ... + 562.

It is an arithmetic number, because the mean of its divisors is an integer number (39114).

2¹⁵⁵⁶⁴⁷ is an apocalyptic number.

155647 is a deficient number, since it is larger than the sum of its proper divisors (809).

155647 is an equidigital number, since it uses as much as digits as its factorization.

155647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808.

The product of its digits is 4200, while the sum is 28.

The square root of 155647 is about 394.5212288331. The cubic root of 155647 is about 53.7914913093.

The spelling of 155647 in words is "one hundred fifty-five thousand, six hundred forty-seven".