1421005 has 4 divisors (see below), whose sum is σ = 1705212. Its totient is φ = 1136800.

The previous prime is 1420999. The next prime is 1421011. The reversal of 1421005 is 5001241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5001241 = 7 ⋅714463.

It is an interprime number because it is at equal distance from previous prime (1420999) and next prime (1421011).

It can be written as a sum of positive squares in 2 ways, for example, as 335241 + 1085764 = 579^2 + 1042^2 .

It is not a de Polignac number, because 1421005 - 2⁹ = 1420493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142096 + ... + 142105.

It is an arithmetic number, because the mean of its divisors is an integer number (426303).

2^1421005 is an apocalyptic number.

It is an amenable number.

1421005 is a deficient number, since it is larger than the sum of its proper divisors (284207).

1421005 is an equidigital number, since it uses as much as digits as its factorization.

1421005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284206.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1421005 is about 1192.0591428281. The cubic root of 1421005 is about 112.4255968941.

Adding to 1421005 its reverse (5001241), we get a palindrome (6422246).

The spelling of 1421005 in words is "one million, four hundred twenty-one thousand, five".