1338191 has 4 divisors (see below), whose sum is σ = 1358232. Its totient is φ = 1318152.

The previous prime is 1338167. The next prime is 1338217. The reversal of 1338191 is 1918331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1918331 = 17 ⋅112843.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1338191 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 1338191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338101) 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, 9920 + ... + 10053.

It is an arithmetic number, because the mean of its divisors is an integer number (339558).

2^1338191 is an apocalyptic number.

1338191 is a deficient number, since it is larger than the sum of its proper divisors (20041).

1338191 is an equidigital number, since it uses as much as digits as its factorization.

1338191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20040.

The product of its digits is 648, while the sum is 26.

The square root of 1338191 is about 1156.8020573979. The cubic root of 1338191 is about 110.1977434834.

The spelling of 1338191 in words is "one million, three hundred thirty-eight thousand, one hundred ninety-one".