158440 has 32 divisors (see below), whose sum is σ = 379080. Its totient is φ = 59392.

The previous prime is 158429. The next prime is 158443. The reversal of 158440 is 44851.

158440 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 4 ways, for example, as 125316 + 33124 = 354^2 + 182^2 .

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (158443) 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, 564 + ... + 796.

2¹⁵⁸⁴⁴⁰ is an apocalyptic number.

158440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189540).

158440 is an abundant number, since it is smaller than the sum of its proper divisors (220640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

158440 is a wasteful number, since it uses less digits than its factorization.

158440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 158440 is about 398.0452235613. The cubic root of 158440 is about 54.1113386397. Note that the first 3 decimals are identical.

The spelling of 158440 in words is "one hundred fifty-eight thousand, four hundred forty".