40989779 has 2 divisors, whose sum is σ = 40989780. Its totient is φ = 40989778.

The previous prime is 40989763. The next prime is 40989787. The reversal of 40989779 is 97798904.

40989779 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 40989779 - 2⁴ = 40989763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40989779.

It is not a weakly prime, because it can be changed into another prime (40989679) 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, 20494889 + 20494890.

It is an arithmetic number, because the mean of its divisors is an integer number (20494890).

Almost surely, 2^40989779 is an apocalyptic number.

40989779 is a deficient number, since it is larger than the sum of its proper divisors (1).

40989779 is an equidigital number, since it uses as much as digits as its factorization.

40989779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 40989779 is about 6402.3260616748. The cubic root of 40989779 is about 344.7930678126.

The spelling of 40989779 in words is "forty million, nine hundred eighty-nine thousand, seven hundred seventy-nine".