4065820 has 24 divisors (see below), whose sum is σ = 9314928. Its totient is φ = 1478400.

The previous prime is 4065781. The next prime is 4065821. The reversal of 4065820 is 285604.

4065820 = T₁₉₈ + T₁₉₉ + ... + T₃₁₇.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4065821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9021 + ... + 9460.

It is an arithmetic number, because the mean of its divisors is an integer number (388122).

Almost surely, 2^4065820 is an apocalyptic number.

It is an amenable number.

4065820 is an abundant number, since it is smaller than the sum of its proper divisors (5249108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4065820 is a wasteful number, since it uses less digits than its factorization.

4065820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18501 (or 18499 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 4065820 is about 2016.3878595151. The cubic root of 4065820 is about 159.6060621270.

It can be divided in two parts, 406 and 5820, that added together give a palindrome (6226).

The spelling of 4065820 in words is "four million, sixty-five thousand, eight hundred twenty".