1228831 has 4 divisors (see below), whose sum is σ = 1235392. Its totient is φ = 1222272.

The previous prime is 1228789. The next prime is 1228837. The reversal of 1228831 is 1388221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1388221 = 137 ⋅10133.

It is a cyclic number.

It is not a de Polignac number, because 1228831 - 2¹¹ = 1226783 is a prime.

It is a super-2 number, since 2×1228831² = 3020051253122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1228796 and 1228805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228837) 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, 2991 + ... + 3376.

It is an arithmetic number, because the mean of its divisors is an integer number (308848).

2^1228831 is an apocalyptic number.

1228831 is a deficient number, since it is larger than the sum of its proper divisors (6561).

1228831 is an equidigital number, since it uses as much as digits as its factorization.

1228831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6560.

The product of its digits is 768, while the sum is 25.

The square root of 1228831 is about 1108.5264994577. The cubic root of 1228831 is about 107.1101727183.

The spelling of 1228831 in words is "one million, two hundred twenty-eight thousand, eight hundred thirty-one".