938156993 has 4 divisors (see below), whose sum is σ = 941359188. Its totient is φ = 934954800.

The previous prime is 938156987. The next prime is 938157007. The reversal of 938156993 is 399651839.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 712195969 + 225961024 = 26687^2 + 15032^2 .

It is a cyclic number.

It is not a de Polignac number, because 938156993 - 2¹⁰ = 938155969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (938156953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600658 + ... + 1601243.

It is an arithmetic number, because the mean of its divisors is an integer number (235339797).

Almost surely, 2^938156993 is an apocalyptic number.

It is an amenable number.

938156993 is a deficient number, since it is larger than the sum of its proper divisors (3202195).

938156993 is a wasteful number, since it uses less digits than its factorization.

938156993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202194.

The product of its digits is 1574640, while the sum is 53.

The square root of 938156993 is about 30629.3485565723. The cubic root of 938156993 is about 978.9454827409.

The spelling of 938156993 in words is "nine hundred thirty-eight million, one hundred fifty-six thousand, nine hundred ninety-three".