1128421 has 6 divisors (see below), whose sum is σ = 1312710. Its totient is φ = 967176.

The previous prime is 1128397. The next prime is 1128427. The reversal of 1128421 is 1248211.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1102500 + 25921 = 1050^2 + 161^2 .

It is not a de Polignac number, because 1128421 - 2⁷ = 1128293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128427) 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, 11466 + ... + 11563.

It is an arithmetic number, because the mean of its divisors is an integer number (218785).

2^1128421 is an apocalyptic number.

It is an amenable number.

1128421 is a deficient number, since it is larger than the sum of its proper divisors (184289).

1128421 is an equidigital number, since it uses as much as digits as its factorization.

1128421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23043 (or 23036 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

The square root of 1128421 is about 1062.2716225147. The cubic root of 1128421 is about 104.1095062039.

The spelling of 1128421 in words is "one million, one hundred twenty-eight thousand, four hundred twenty-one".