40778789 has 4 divisors (see below), whose sum is σ = 40791660. Its totient is φ = 40765920.

The previous prime is 40778761. The next prime is 40778791. The reversal of 40778789 is 98787704.

40778789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 40538689 + 240100 = 6367^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 40778789 - 2⁸ = 40778533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40778719) 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 in 3 ways as a sum of consecutive naturals, for example, 2027 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (10197915).

Almost surely, 2^40778789 is an apocalyptic number.

It is an amenable number.

40778789 is a deficient number, since it is larger than the sum of its proper divisors (12871).

40778789 is an equidigital number, since it uses as much as digits as its factorization.

40778789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 40778789 is about 6385.8271977873. The cubic root of 40778789 is about 344.2004561121.

The spelling of 40778789 in words is "forty million, seven hundred seventy-eight thousand, seven hundred eighty-nine".