1420705 has 16 divisors (see below), whose sum is σ = 2003904. Its totient is φ = 953280.

The previous prime is 1420697. The next prime is 1420717. The reversal of 1420705 is 5070241.

1420705 = T₇₈ + T₇₉ + ... + T₂₀₇.

It is not a de Polignac number, because 1420705 - 2³ = 1420697 is a prime.

It is a Duffinian number.

1420705 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279 + ... + 1708.

It is an arithmetic number, because the mean of its divisors is an integer number (125244).

2^1420705 is an apocalyptic number.

It is an amenable number.

1420705 is a deficient number, since it is larger than the sum of its proper divisors (583199).

1420705 is a wasteful number, since it uses less digits than its factorization.

1420705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 1420705 is about 1191.9333035032. The cubic root of 1420705 is about 112.4176846412.

Adding to 1420705 its reverse (5070241), we get a palindrome (6490946).

The spelling of 1420705 in words is "one million, four hundred twenty thousand, seven hundred five".