1320428 has 12 divisors (see below), whose sum is σ = 2390640. Its totient is φ = 637392.

The previous prime is 1320427. The next prime is 1320433. The reversal of 1320428 is 8240231.

It is not an unprimeable number, because it can be changed into a prime (1320421) 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, 5576 + ... + 5807.

It is an arithmetic number, because the mean of its divisors is an integer number (199220).

2^1320428 is an apocalyptic number.

It is an amenable number.

1320428 is a deficient number, since it is larger than the sum of its proper divisors (1070212).

1320428 is a wasteful number, since it uses less digits than its factorization.

1320428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416 (or 11414 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1320428 is about 1149.0987773033. The cubic root of 1320428 is about 109.7079858140.

Adding to 1320428 its reverse (8240231), we get a palindrome (9560659).

The spelling of 1320428 in words is "one million, three hundred twenty thousand, four hundred twenty-eight".