4040021305 has 16 divisors (see below), whose sum is σ = 5100503184. Its totient is φ = 3067960320.

The previous prime is 4040021303. The next prime is 4040021317. The reversal of 4040021305 is 5031200404.

It can be written as a sum of positive squares in 8 ways, for example, as 614494521 + 3425526784 = 24789^2 + 58528^2 .

It is not a de Polignac number, because 4040021305 - 2¹ = 4040021303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4040021303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258732 + ... + 273901.

It is an arithmetic number, because the mean of its divisors is an integer number (318781449).

Almost surely, 2^4040021305 is an apocalyptic number.

It is an amenable number.

4040021305 is a deficient number, since it is larger than the sum of its proper divisors (1060481879).

4040021305 is a wasteful number, since it uses less digits than its factorization.

4040021305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532716.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 4040021305 is about 63561.1619229856. The cubic root of 4040021305 is about 1592.6776480177.

Adding to 4040021305 its reverse (5031200404), we get a palindrome (9071221709).

The spelling of 4040021305 in words is "four billion, forty million, twenty-one thousand, three hundred five".