1313028 has 18 divisors (see below), whose sum is σ = 3319134. Its totient is φ = 437664.

The previous prime is 1312967. The next prime is 1313041. The reversal of 1313028 is 8203131.

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 248004 = 1032^2 + 498^2 .

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 a self number, because there is not a number n which added to its sum of digits gives 1313028.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18201 + ... + 18272.

2^1313028 is an apocalyptic number.

1313028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1313028 is an abundant number, since it is smaller than the sum of its proper divisors (2006106).

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

1313028 is a wasteful number, since it uses less digits than its factorization.

1313028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36483 (or 36478 counting only the distinct ones).

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

The square root of 1313028 is about 1145.8743386602. The cubic root of 1313028 is about 109.5026583454.

Subtracting from 1313028 its sum of digits (18), we obtain a triangular number (1313010 = T₁₆₂₀).

Adding to 1313028 its reverse (8203131), we get a palindrome (9516159).

It can be divided in two parts, 13 and 13028, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 1313028 in words is "one million, three hundred thirteen thousand, twenty-eight".