158403 has 16 divisors (see below), whose sum is σ = 254720. Its totient is φ = 85536.

The previous prime is 158393. The next prime is 158407. The reversal of 158403 is 304851.

158403 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 is not a de Polignac number, because 158403 - 2⁵ = 158371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a D-number.

It is a Duffinian number.

158403 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 158403.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158403.

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 15 ways as a sum of consecutive naturals, for example, 201 + ... + 597.

It is an arithmetic number, because the mean of its divisors is an integer number (15920).

2¹⁵⁸⁴⁰³ is an apocalyptic number.

158403 is a deficient number, since it is larger than the sum of its proper divisors (96317).

158403 is a wasteful number, since it uses less digits than its factorization.

158403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 158403 is about 397.9987437166. The cubic root of 158403 is about 54.1071261610.

It can be divided in two parts, 158 and 403, that added together give a triangular number (561 = T₃₃).

The spelling of 158403 in words is "one hundred fifty-eight thousand, four hundred three".