40778559 has 24 divisors (see below), whose sum is σ = 62589072. Its totient is φ = 26516160.

The previous prime is 40778539. The next prime is 40778581. The reversal of 40778559 is 95587704.

It is not a de Polignac number, because 40778559 - 2¹⁹ = 40254271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40778539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7917 + ... + 12009.

It is an arithmetic number, because the mean of its divisors is an integer number (2607878).

Almost surely, 2^40778559 is an apocalyptic number.

40778559 is a deficient number, since it is larger than the sum of its proper divisors (21810513).

40778559 is an equidigital number, since it uses as much as digits as its factorization.

40778559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149 (or 4137 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The square root of 40778559 is about 6385.8091891318. The cubic root of 40778559 is about 344.1998089926.

The spelling of 40778559 in words is "forty million, seven hundred seventy-eight thousand, five hundred fifty-nine".