40491779 has 2 divisors, whose sum is σ = 40491780. Its totient is φ = 40491778.

The previous prime is 40491757. The next prime is 40491811. The reversal of 40491779 is 97719404.

It is a happy number.

40491779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40491779 - 2²⁰ = 39443203 is a prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (40491749) 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, 20245889 + 20245890.

It is an arithmetic number, because the mean of its divisors is an integer number (20245890).

Almost surely, 2^40491779 is an apocalyptic number.

40491779 is a deficient number, since it is larger than the sum of its proper divisors (1).

40491779 is an equidigital number, since it uses as much as digits as its factorization.

40491779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 40491779 is about 6363.3150951371. The cubic root of 40491779 is about 343.3910349077.

The spelling of 40491779 in words is "forty million, four hundred ninety-one thousand, seven hundred seventy-nine".