1428191 has 4 divisors (see below), whose sum is σ = 1455192. Its totient is φ = 1401192.

The previous prime is 1428179. The next prime is 1428197. The reversal of 1428191 is 1918241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1918241 = 13 ⋅147557.

It is a cyclic number.

It is not a de Polignac number, because 1428191 - 2⁶ = 1428127 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 1428191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428197) 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, 13421 + ... + 13526.

It is an arithmetic number, because the mean of its divisors is an integer number (363798).

2^1428191 is an apocalyptic number.

1428191 is a deficient number, since it is larger than the sum of its proper divisors (27001).

1428191 is an equidigital number, since it uses as much as digits as its factorization.

1428191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27000.

The product of its digits is 576, while the sum is 26.

The square root of 1428191 is about 1195.0694540486. The cubic root of 1428191 is about 112.6147898298.

The spelling of 1428191 in words is "one million, four hundred twenty-eight thousand, one hundred ninety-one".