1420805 has 4 divisors (see below), whose sum is σ = 1704972. Its totient is φ = 1136640.

The previous prime is 1420789. The next prime is 1420807. The reversal of 1420805 is 5080241.

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 351649 + 1069156 = 593^2 + 1034^2 .

It is not a de Polignac number, because 1420805 - 2⁴ = 1420789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420807) 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, 142076 + ... + 142085.

It is an arithmetic number, because the mean of its divisors is an integer number (426243).

2^1420805 is an apocalyptic number.

It is an amenable number.

1420805 is a deficient number, since it is larger than the sum of its proper divisors (284167).

1420805 is an equidigital number, since it uses as much as digits as its factorization.

1420805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284166.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1420805 is about 1191.9752514209. The cubic root of 1420805 is about 112.4203221825.

The spelling of 1420805 in words is "one million, four hundred twenty thousand, eight hundred five".