1388191 has 4 divisors (see below), whose sum is σ = 1586512. Its totient is φ = 1189872.

The previous prime is 1388183. The next prime is 1388227. The reversal of 1388191 is 1918831.

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

It is a cyclic number.

It is not a de Polignac number, because 1388191 - 2³ = 1388183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99150 + ... + 99163.

It is an arithmetic number, because the mean of its divisors is an integer number (396628).

2^1388191 is an apocalyptic number.

1388191 is a deficient number, since it is larger than the sum of its proper divisors (198321).

1388191 is an equidigital number, since it uses as much as digits as its factorization.

1388191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198320.

The product of its digits is 1728, while the sum is 31.

The square root of 1388191 is about 1178.2151755940. The cubic root of 1388191 is about 111.5534676234.

The spelling of 1388191 in words is "one million, three hundred eighty-eight thousand, one hundred ninety-one".