155984 has 10 divisors (see below), whose sum is σ = 302250. Its totient is φ = 77984.

The previous prime is 155921. The next prime is 156007. The reversal of 155984 is 489551.

It can be written as a sum of positive squares in only one way, i.e., 107584 + 48400 = 328^2 + 220^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155984.

It is a congruent number.

It is an unprimeable number.

155984 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4859 + ... + 4890.

It is an arithmetic number, because the mean of its divisors is an integer number (30225).

2¹⁵⁵⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

155984 is a deficient number, since it is larger than the sum of its proper divisors (146266).

155984 is an equidigital number, since it uses as much as digits as its factorization.

155984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9757 (or 9751 counting only the distinct ones).

The product of its digits is 7200, while the sum is 32.

The square root of 155984 is about 394.9480978559. The cubic root of 155984 is about 53.8302856434.

The spelling of 155984 in words is "one hundred fifty-five thousand, nine hundred eighty-four".