1421705 has 4 divisors (see below), whose sum is σ = 1706052. Its totient is φ = 1137360.

The previous prime is 1421689. The next prime is 1421711. The reversal of 1421705 is 5071241.

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 478864 + 942841 = 692^2 + 971^2 .

It is not a de Polignac number, because 1421705 - 2⁴ = 1421689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142166 + ... + 142175.

It is an arithmetic number, because the mean of its divisors is an integer number (426513).

2^1421705 is an apocalyptic number.

It is an amenable number.

1421705 is a deficient number, since it is larger than the sum of its proper divisors (284347).

1421705 is an equidigital number, since it uses as much as digits as its factorization.

1421705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284346.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1421705 is about 1192.3527162715. The cubic root of 1421705 is about 112.4440544878. Note that the first 3 decimals are identical.

Adding to 1421705 its reverse (5071241), we get a palindrome (6492946).

The spelling of 1421705 in words is "one million, four hundred twenty-one thousand, seven hundred five".