4020785 has 4 divisors (see below), whose sum is σ = 4824948. Its totient is φ = 3216624.

The previous prime is 4020781. The next prime is 4020833. The reversal of 4020785 is 5870204.

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 512656 + 3508129 = 716^2 + 1873^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020785 - 2² = 4020781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4020781) 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, 402074 + ... + 402083.

It is an arithmetic number, because the mean of its divisors is an integer number (1206237).

Almost surely, 2^4020785 is an apocalyptic number.

It is an amenable number.

4020785 is a deficient number, since it is larger than the sum of its proper divisors (804163).

4020785 is an equidigital number, since it uses as much as digits as its factorization.

4020785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804162.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 4020785 is about 2005.1895172277. The cubic root of 4020785 is about 159.0145814192.

Adding to 4020785 its reverse (5870204), we get a palindrome (9890989).

The spelling of 4020785 in words is "four million, twenty thousand, seven hundred eighty-five".