1428421 has 4 divisors (see below), whose sum is σ = 1431244. Its totient is φ = 1425600.

The previous prime is 1428419. The next prime is 1428431. The reversal of 1428421 is 1248241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1020100 + 408321 = 1010^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428421 - 2¹ = 1428419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1428392 and 1428401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428431) 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, 420 + ... + 1741.

It is an arithmetic number, because the mean of its divisors is an integer number (357811).

2^1428421 is an apocalyptic number.

It is an amenable number.

1428421 is a deficient number, since it is larger than the sum of its proper divisors (2823).

1428421 is an equidigital number, since it uses as much as digits as its factorization.

1428421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822.

The product of its digits is 512, while the sum is 22.

The square root of 1428421 is about 1195.1656788914. The cubic root of 1428421 is about 112.6208347755.

It can be divided in two parts, 1428 and 421, that added together give a square (1849 = 43²).

The spelling of 1428421 in words is "one million, four hundred twenty-eight thousand, four hundred twenty-one".