1188238993 has 4 divisors (see below), whose sum is σ = 1188502848. Its totient is φ = 1187975140.

The previous prime is 1188238981. The next prime is 1188239023. The reversal of 1188238993 is 3998328811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1188238993 - 2⁹ = 1188238481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1188238993.

It is not an unprimeable number, because it can be changed into a prime (1188238193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125053 + ... + 134218.

It is an arithmetic number, because the mean of its divisors is an integer number (297125712).

Almost surely, 2^1188238993 is an apocalyptic number.

It is an amenable number.

1188238993 is a deficient number, since it is larger than the sum of its proper divisors (263855).

1188238993 is an equidigital number, since it uses as much as digits as its factorization.

1188238993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263854.

The product of its digits is 746496, while the sum is 52.

The square root of 1188238993 is about 34470.8426499846. The cubic root of 1188238993 is about 1059.1755167567.

The spelling of 1188238993 in words is "one billion, one hundred eighty-eight million, two hundred thirty-eight thousand, nine hundred ninety-three".