40823521 has 2 divisors, whose sum is σ = 40823522. Its totient is φ = 40823520.

The previous prime is 40823501. The next prime is 40823537. The reversal of 40823521 is 12532804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35533521 + 5290000 = 5961^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 40823521 - 2⁹ = 40823009 is a prime.

It is equal to p_2480731 and since 40823521 and 2480731 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40823501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20411760 + 20411761.

It is an arithmetic number, because the mean of its divisors is an integer number (20411761).

Almost surely, 2^40823521 is an apocalyptic number.

It is an amenable number.

40823521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40823521 is an equidigital number, since it uses as much as digits as its factorization.

40823521 is an odious number, because the sum of its binary digits is odd.

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

The square root of 40823521 is about 6389.3286814813. The cubic root of 40823521 is about 344.3262661947.

The spelling of 40823521 in words is "forty million, eight hundred twenty-three thousand, five hundred twenty-one".