1231328 has 48 divisors (see below), whose sum is σ = 2903040. Its totient is φ = 502656.

The previous prime is 1231319. The next prime is 1231337. The reversal of 1231328 is 8231321.

It is an interprime number because it is at equal distance from previous prime (1231319) and next prime (1231337).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5033 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2^1231328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451520).

1231328 is an abundant number, since it is smaller than the sum of its proper divisors (1671712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231328 is a wasteful number, since it uses less digits than its factorization.

1231328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 271 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 1231328 is about 1109.6521977629. The cubic root of 1231328 is about 107.1826733710.

Adding to 1231328 its reverse (8231321), we get a palindrome (9462649).

The spelling of 1231328 in words is "one million, two hundred thirty-one thousand, three hundred twenty-eight".