1331428 has 18 divisors (see below), whose sum is σ = 2710806. Its totient is φ = 570528.

The previous prime is 1331411. The next prime is 1331431. The reversal of 1331428 is 8241331.

It can be written as a sum of positive squares in only one way, i.e., 879844 + 451584 = 938^2 + 672^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1331399 and 1331408.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3201 + ... + 3592.

2^1331428 is an apocalyptic number.

It is an amenable number.

1331428 is an abundant number, since it is smaller than the sum of its proper divisors (1379378).

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

1331428 is a wasteful number, since it uses less digits than its factorization.

1331428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6811 (or 6802 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 1331428 is about 1153.8752098906. The cubic root of 1331428 is about 110.0117893700.

Adding to 1331428 its reverse (8241331), we get a palindrome (9572759).

Subtracting 1331428 from its reverse (8241331), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1331428 in words is "one million, three hundred thirty-one thousand, four hundred twenty-eight".