238533993 has 6 divisors (see below), whose sum is σ = 344549114. Its totient is φ = 159022656.

The previous prime is 238533959. The next prime is 238534007. The reversal of 238533993 is 399335832.

It is a happy number.

238533993 is a `hidden beast` number, since 23 + 8 + 533 + 9 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 236759769 + 1774224 = 15387^2 + 1332^2 .

It is not a de Polignac number, because 238533993 - 2⁹ = 238533481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238533293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13251880 + ... + 13251897.

Almost surely, 2^238533993 is an apocalyptic number.

It is an amenable number.

238533993 is a deficient number, since it is larger than the sum of its proper divisors (106015121).

238533993 is a wasteful number, since it uses less digits than its factorization.

238533993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26503783 (or 26503780 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 238533993 is about 15444.5457362786. The cubic root of 238533993 is about 620.1785758586.

The spelling of 238533993 in words is "two hundred thirty-eight million, five hundred thirty-three thousand, nine hundred ninety-three".