32158993 has 4 divisors (see below), whose sum is σ = 32520420. Its totient is φ = 31797568.

The previous prime is 32158981. The next prime is 32159003. The reversal of 32158993 is 39985123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39985123 = 37 ⋅1080679.

It can be written as a sum of positive squares in 2 ways, for example, as 3504384 + 28654609 = 1872^2 + 5353^2 .

It is a cyclic number.

It is not a de Polignac number, because 32158993 - 2¹⁷ = 32027921 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32158913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180580 + ... + 180757.

It is an arithmetic number, because the mean of its divisors is an integer number (8130105).

Almost surely, 2^32158993 is an apocalyptic number.

It is an amenable number.

32158993 is a deficient number, since it is larger than the sum of its proper divisors (361427).

32158993 is an equidigital number, since it uses as much as digits as its factorization.

32158993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361426.

The product of its digits is 58320, while the sum is 40.

The square root of 32158993 is about 5670.8899654287. The cubic root of 32158993 is about 318.0051454147.

The spelling of 32158993 in words is "thirty-two million, one hundred fifty-eight thousand, nine hundred ninety-three".