1428091 has 4 divisors (see below), whose sum is σ = 1632112. Its totient is φ = 1224072.

The previous prime is 1428079. The next prime is 1428109. The reversal of 1428091 is 1908241.

It is a happy number.

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 1428091 - 2⁷ = 1427963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428041) 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, 102000 + ... + 102013.

It is an arithmetic number, because the mean of its divisors is an integer number (408028).

2^1428091 is an apocalyptic number.

1428091 is a deficient number, since it is larger than the sum of its proper divisors (204021).

1428091 is an equidigital number, since it uses as much as digits as its factorization.

1428091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204020.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1428091 is about 1195.0276147437. The cubic root of 1428091 is about 112.6121613901.

The spelling of 1428091 in words is "one million, four hundred twenty-eight thousand, ninety-one".