155439 has 20 divisors (see below), whose sum is σ = 246840. Its totient is φ = 97200.

The previous prime is 155423. The next prime is 155443. The reversal of 155439 is 934551.

It is not a de Polignac number, because 155439 - 2⁴ = 155423 is a prime.

It is a super-2 number, since 2×155439² = 48322565442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155539) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1489 + ... + 1589.

It is an arithmetic number, because the mean of its divisors is an integer number (12342).

2¹⁵⁵⁴³⁹ is an apocalyptic number.

155439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

155439 is a deficient number, since it is larger than the sum of its proper divisors (91401).

155439 is a wasteful number, since it uses less digits than its factorization.

155439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 123 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 155439 is about 394.2575300486. The cubic root of 155439 is about 53.7675190774.

It can be divided in two parts, 1554 and 39, that multiplied together give a palindrome (60606).

The spelling of 155439 in words is "one hundred fifty-five thousand, four hundred thirty-nine".