1331028 has 18 divisors (see below), whose sum is σ = 3364634. Its totient is φ = 443664.

The previous prime is 1331023. The next prime is 1331039. The reversal of 1331028 is 8201331.

It can be written as a sum of positive squares in only one way, i.e., 956484 + 374544 = 978^2 + 612^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18451 + ... + 18522.

2^1331028 is an apocalyptic number.

1331028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1331028 is an abundant number, since it is smaller than the sum of its proper divisors (2033606).

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

1331028 is a wasteful number, since it uses less digits than its factorization.

1331028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36983 (or 36978 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1331028 is about 1153.7018679018. The cubic root of 1331028 is about 110.0007713445. Note that the first 3 decimals are identical.

Adding to 1331028 its reverse (8201331), we get a palindrome (9532359).

The spelling of 1331028 in words is "one million, three hundred thirty-one thousand, twenty-eight".