4040020 has 12 divisors (see below), whose sum is σ = 8484084. Its totient is φ = 1616000.

The previous prime is 4040011. The next prime is 4040021. The reversal of 4040020 is 200404.

It can be written as a sum of positive squares in 2 ways, for example, as 3083536 + 956484 = 1756^2 + 978^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 4039979 and 4040006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4040021) 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, 100981 + ... + 101020.

It is an arithmetic number, because the mean of its divisors is an integer number (707007).

Almost surely, 2^4040020 is an apocalyptic number.

It is an amenable number.

4040020 is an abundant number, since it is smaller than the sum of its proper divisors (4444064).

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

4040020 is a wasteful number, since it uses less digits than its factorization.

4040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202010 (or 202008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 4040020 is about 2009.9800994040. The cubic root of 4040020 is about 159.2677476530.

Adding to 4040020 its reverse (200404), we get a palindrome (4240424).

The spelling of 4040020 in words is "four million, forty thousand, twenty".