158171920 has 160 divisors (see below), whose sum is σ = 411402240. Its totient is φ = 56348160.

The previous prime is 158171899. The next prime is 158171921. The reversal of 158171920 is 29171851.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (158171921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2680851 + ... + 2680909.

It is an arithmetic number, because the mean of its divisors is an integer number (2571264).

Almost surely, 2^158171920 is an apocalyptic number.

158171920 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 158171920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205701120).

158171920 is an abundant number, since it is smaller than the sum of its proper divisors (253230320).

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

158171920 is a wasteful number, since it uses less digits than its factorization.

158171920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 158171920 is about 12576.6418411275. The cubic root of 158171920 is about 540.8080267065.

The spelling of 158171920 in words is "one hundred fifty-eight million, one hundred seventy-one thousand, nine hundred twenty".