1239138193 has 4 divisors (see below), whose sum is σ = 1239268788. Its totient is φ = 1239007600.

The previous prime is 1239138161. The next prime is 1239138233. The reversal of 1239138193 is 3918319321.

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 1103369089 + 135769104 = 33217^2 + 11652^2 .

It is a cyclic number.

It is not a de Polignac number, because 1239138193 - 2⁵ = 1239138161 is a prime.

It is a super-2 number, since 2×1239138193² = 3070926922702610498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1239138793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49846 + ... + 70447.

It is an arithmetic number, because the mean of its divisors is an integer number (309817197).

Almost surely, 2^1239138193 is an apocalyptic number.

It is an amenable number.

1239138193 is a deficient number, since it is larger than the sum of its proper divisors (130595).

1239138193 is a wasteful number, since it uses less digits than its factorization.

1239138193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130594.

The product of its digits is 34992, while the sum is 40.

The square root of 1239138193 is about 35201.3947592990. The cubic root of 1239138193 is about 1074.0881231970.

The spelling of 1239138193 in words is "one billion, two hundred thirty-nine million, one hundred thirty-eight thousand, one hundred ninety-three".