1421305 has 4 divisors (see below), whose sum is σ = 1705572. Its totient is φ = 1137040.

The previous prime is 1421293. The next prime is 1421309. The reversal of 1421305 is 5031241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5031241 = 103 ⋅48847.

It can be written as a sum of positive squares in 2 ways, for example, as 535824 + 885481 = 732^2 + 941^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1421305 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421309) 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, 142126 + ... + 142135.

It is an arithmetic number, because the mean of its divisors is an integer number (426393).

2^1421305 is an apocalyptic number.

It is an amenable number.

1421305 is a deficient number, since it is larger than the sum of its proper divisors (284267).

1421305 is an equidigital number, since it uses as much as digits as its factorization.

1421305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284266.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1421305 is about 1192.1849688702. The cubic root of 1421305 is about 112.4335080335.

Adding to 1421305 its reverse (5031241), we get a palindrome (6452546).

The spelling of 1421305 in words is "one million, four hundred twenty-one thousand, three hundred five".