4020365 has 4 divisors (see below), whose sum is σ = 4824444. Its totient is φ = 3216288.

The previous prime is 4020361. The next prime is 4020407. The reversal of 4020365 is 5630204.

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 586756 + 3433609 = 766^2 + 1853^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020365 - 2² = 4020361 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 (4020361) 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, 402032 + ... + 402041.

It is an arithmetic number, because the mean of its divisors is an integer number (1206111).

Almost surely, 2^4020365 is an apocalyptic number.

It is an amenable number.

4020365 is a deficient number, since it is larger than the sum of its proper divisors (804079).

4020365 is an equidigital number, since it uses as much as digits as its factorization.

4020365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804078.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 4020365 is about 2005.0847862372. The cubic root of 4020365 is about 159.0090444864.

Adding to 4020365 its reverse (5630204), we get a palindrome (9650569).

The spelling of 4020365 in words is "four million, twenty thousand, three hundred sixty-five".