158409 has 8 divisors (see below), whose sum is σ = 234720. Its totient is φ = 105588.

The previous prime is 158407. The next prime is 158419. The reversal of 158409 is 904851.

158409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 158409 - 2¹ = 158407 is a prime.

It is a super-2 number, since 2×158409² = 50186822562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5867 = 158409 / (1 + 5 + 8 + 4 + 0 + 9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (158407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2907 + ... + 2960.

It is an arithmetic number, because the mean of its divisors is an integer number (29340).

2¹⁵⁸⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

158409 is a deficient number, since it is larger than the sum of its proper divisors (76311).

158409 is an equidigital number, since it uses as much as digits as its factorization.

158409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876 (or 5870 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 158409 is about 398.0062813575. The cubic root of 158409 is about 54.1078093102.

The spelling of 158409 in words is "one hundred fifty-eight thousand, four hundred nine".