1131428 has 12 divisors (see below), whose sum is σ = 2012892. Its totient is φ = 556320.

The previous prime is 1131421. The next prime is 1131437. The reversal of 1131428 is 8241311.

It can be written as a sum of positive squares in 2 ways, for example, as 135424 + 996004 = 368^2 + 998^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1131421) 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, 2075 + ... + 2562.

It is an arithmetic number, because the mean of its divisors is an integer number (167741).

2^1131428 is an apocalyptic number.

It is an amenable number.

1131428 is a deficient number, since it is larger than the sum of its proper divisors (881464).

1131428 is a wasteful number, since it uses less digits than its factorization.

1131428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702 (or 4700 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 1131428 is about 1063.6860439058. The cubic root of 1131428 is about 104.2019006853.

Adding to 1131428 its reverse (8241311), we get a palindrome (9372739).

The spelling of 1131428 in words is "one million, one hundred thirty-one thousand, four hundred twenty-eight".