158405 has 8 divisors (see below), whose sum is σ = 204792. Its totient is φ = 116928.

The previous prime is 158393. The next prime is 158407. The reversal of 158405 is 504851.

158405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 398²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 23716 + 134689 = 154^2 + 367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158405 - 2⁶ = 158341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158405.

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, 1154 + ... + 1283.

It is an arithmetic number, because the mean of its divisors is an integer number (25599).

2¹⁵⁸⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

158405 is a deficient number, since it is larger than the sum of its proper divisors (46387).

158405 is a wasteful number, since it uses less digits than its factorization.

158405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 158405 is about 398.0012562794. The cubic root of 158405 is about 54.1073538793.

The spelling of 158405 in words is "one hundred fifty-eight thousand, four hundred five".