155947 has 4 divisors (see below), whose sum is σ = 170136. Its totient is φ = 141760.

The previous prime is 155921. The next prime is 156007. The reversal of 155947 is 749551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749551 = 11 ⋅68141.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155947 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 (155047) 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, 7078 + ... + 7099.

It is an arithmetic number, because the mean of its divisors is an integer number (42534).

2¹⁵⁵⁹⁴⁷ is an apocalyptic number.

155947 is a deficient number, since it is larger than the sum of its proper divisors (14189).

155947 is a wasteful number, since it uses less digits than its factorization.

155947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14188.

The product of its digits is 6300, while the sum is 31.

The square root of 155947 is about 394.9012534799. The cubic root of 155947 is about 53.8260290571.

The spelling of 155947 in words is "one hundred fifty-five thousand, nine hundred forty-seven".