1420785 has 12 divisors (see below), whose sum is σ = 2462772. Its totient is φ = 757728.

The previous prime is 1420777. The next prime is 1420789. The reversal of 1420785 is 5870241.

It can be written as a sum of positive squares in 2 ways, for example, as 567009 + 853776 = 753^2 + 924^2 .

It is not a de Polignac number, because 1420785 - 2³ = 1420777 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420789) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15742 + ... + 15831.

It is an arithmetic number, because the mean of its divisors is an integer number (205231).

2^1420785 is an apocalyptic number.

1420785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1420785 is a deficient number, since it is larger than the sum of its proper divisors (1041987).

1420785 is a wasteful number, since it uses less digits than its factorization.

1420785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31584 (or 31581 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1420785 is about 1191.9668619555. The cubic root of 1420785 is about 112.4197946842.

The spelling of 1420785 in words is "one million, four hundred twenty thousand, seven hundred eighty-five".