155389 has 4 divisors (see below), whose sum is σ = 167356. Its totient is φ = 143424.

The previous prime is 155387. The next prime is 155399. The reversal of 155389 is 983551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983551 = 769 ⋅1279.

It can be written as a sum of positive squares in 2 ways, for example, as 84100 + 71289 = 290^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 155389 - 2¹ = 155387 is a prime.

It is a Duffinian number.

155389 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 155389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5964 + ... + 5989.

It is an arithmetic number, because the mean of its divisors is an integer number (41839).

2¹⁵⁵³⁸⁹ is an apocalyptic number.

It is an amenable number.

155389 is a deficient number, since it is larger than the sum of its proper divisors (11967).

155389 is a wasteful number, since it uses less digits than its factorization.

155389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11966.

The product of its digits is 5400, while the sum is 31.

The square root of 155389 is about 394.1941146187. The cubic root of 155389 is about 53.7617533338.

The spelling of 155389 in words is "one hundred fifty-five thousand, three hundred eighty-nine".