1428121 has 4 divisors (see below), whose sum is σ = 1433700. Its totient is φ = 1422544.

The previous prime is 1428113. The next prime is 1428127. The reversal of 1428121 is 1218241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1218241 = 23 ⋅52967.

It can be written as a sum of positive squares in 2 ways, for example, as 35721 + 1392400 = 189^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428121 - 2³ = 1428113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2386 + ... + 2923.

It is an arithmetic number, because the mean of its divisors is an integer number (358425).

2^1428121 is an apocalyptic number.

It is an amenable number.

1428121 is a deficient number, since it is larger than the sum of its proper divisors (5579).

1428121 is an equidigital number, since it uses as much as digits as its factorization.

1428121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5578.

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

The square root of 1428121 is about 1195.0401666890. The cubic root of 1428121 is about 112.6129499349.

The spelling of 1428121 in words is "one million, four hundred twenty-eight thousand, one hundred twenty-one".