40821779 has 2 divisors, whose sum is σ = 40821780. Its totient is φ = 40821778.

The previous prime is 40821707. The next prime is 40821787. The reversal of 40821779 is 97712804.

40821779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40821779 - 2⁸ = 40821523 is a prime.

It is not a weakly prime, because it can be changed into another prime (40821799) 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, 20410889 + 20410890.

It is an arithmetic number, because the mean of its divisors is an integer number (20410890).

Almost surely, 2^40821779 is an apocalyptic number.

40821779 is a deficient number, since it is larger than the sum of its proper divisors (1).

40821779 is an equidigital number, since it uses as much as digits as its factorization.

40821779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 40821779 is about 6389.1923589762. The cubic root of 40821779 is about 344.3213684881.

The spelling of 40821779 in words is "forty million, eight hundred twenty-one thousand, seven hundred seventy-nine".