1228421 has 4 divisors (see below), whose sum is σ = 1231692. Its totient is φ = 1225152.

The previous prime is 1228399. The next prime is 1228429. The reversal of 1228421 is 1248221.

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: 1248221 = 13 ⋅96017.

It can be written as a sum of positive squares in 2 ways, for example, as 83521 + 1144900 = 289^2 + 1070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1228393 and 1228402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228429) 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, 986 + ... + 1851.

It is an arithmetic number, because the mean of its divisors is an integer number (307923).

2^1228421 is an apocalyptic number.

It is an amenable number.

1228421 is a deficient number, since it is larger than the sum of its proper divisors (3271).

1228421 is an equidigital number, since it uses as much as digits as its factorization.

1228421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270.

The product of its digits is 256, while the sum is 20.

The square root of 1228421 is about 1108.3415538542. The cubic root of 1228421 is about 107.0982589412.

The spelling of 1228421 in words is "one million, two hundred twenty-eight thousand, four hundred twenty-one".