155869 has 6 divisors (see below), whose sum is σ = 181374. Its totient is φ = 133560.

The previous prime is 155863. The next prime is 155887. The reversal of 155869 is 968551.

155869 = T₅₄ + T₅₅ + ... + T₁₀₂.

155869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 99225 + 56644 = 315^2 + 238^2 .

It is not a de Polignac number, because 155869 - 2³ = 155861 is a prime.

It is a super-2 number, since 2×155869² = 48590290322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1542 + ... + 1639.

It is an arithmetic number, because the mean of its divisors is an integer number (30229).

2¹⁵⁵⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

155869 is a deficient number, since it is larger than the sum of its proper divisors (25505).

155869 is an equidigital number, since it uses as much as digits as its factorization.

155869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195 (or 3188 counting only the distinct ones).

The product of its digits is 10800, while the sum is 34.

The square root of 155869 is about 394.8024822617. The cubic root of 155869 is about 53.8170535068.

It can be divided in two parts, 155 and 869, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 155869 in words is "one hundred fifty-five thousand, eight hundred sixty-nine".