1228791 has 4 divisors (see below), whose sum is σ = 1638392. Its totient is φ = 819192.

The previous prime is 1228789. The next prime is 1228837. The reversal of 1228791 is 1978221.

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

It is not a de Polignac number, because 1228791 - 2¹ = 1228789 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228741) 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, 204796 + ... + 204801.

It is an arithmetic number, because the mean of its divisors is an integer number (409598).

2^1228791 is an apocalyptic number.

1228791 is a deficient number, since it is larger than the sum of its proper divisors (409601).

1228791 is an equidigital number, since it uses as much as digits as its factorization.

1228791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409600.

The product of its digits is 2016, while the sum is 30.

The square root of 1228791 is about 1108.5084573426. The cubic root of 1228791 is about 107.1090105153.

The spelling of 1228791 in words is "one million, two hundred twenty-eight thousand, seven hundred ninety-one".