158385021 has 8 divisors (see below), whose sum is σ = 211596960. Its totient is φ = 105381552.

The previous prime is 158385013. The next prime is 158385043. The reversal of 158385021 is 120583851.

It is a happy number.

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

It is not a de Polignac number, because 158385021 - 2³ = 158385013 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158385001) 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, 50335 + ... + 53388.

It is an arithmetic number, because the mean of its divisors is an integer number (26449620).

Almost surely, 2^158385021 is an apocalyptic number.

It is an amenable number.

158385021 is a deficient number, since it is larger than the sum of its proper divisors (53211939).

158385021 is a wasteful number, since it uses less digits than its factorization.

158385021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104235.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 158385021 is about 12585.1110841343. Note that the first 3 decimals coincide. The cubic root of 158385021 is about 541.0507900104.

The spelling of 158385021 in words is "one hundred fifty-eight million, three hundred eighty-five thousand, twenty-one".