4040921 has 2 divisors, whose sum is σ = 4040922. Its totient is φ = 4040920.

The previous prime is 4040903. The next prime is 4040941. The reversal of 4040921 is 1290404.

It is an a-pointer prime, because the next prime (4040941) can be obtained adding 4040921 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3463321 + 577600 = 1861^2 + 760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4040921 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4040893 and 4040902.

It is not a weakly prime, because it can be changed into another prime (4040941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020460 + 2020461.

It is an arithmetic number, because the mean of its divisors is an integer number (2020461).

Almost surely, 2^4040921 is an apocalyptic number.

It is an amenable number.

4040921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4040921 is an equidigital number, since it uses as much as digits as its factorization.

4040921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4040921 is about 2010.2042184813. The cubic root of 4040921 is about 159.2795866682.

The spelling of 4040921 in words is "four million, forty thousand, nine hundred twenty-one".