40400400077 has 2 divisors, whose sum is σ = 40400400078. Its totient is φ = 40400400076.

The previous prime is 40400400043. The next prime is 40400400097. The reversal of 40400400077 is 77000400404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27527455396 + 12872944681 = 165914^2 + 113459^2 .

It is a cyclic number.

It is not a de Polignac number, because 40400400077 - 2¹⁸ = 40400137933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40400400097) 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 as a sum of consecutive naturals, namely, 20200200038 + 20200200039.

It is an arithmetic number, because the mean of its divisors is an integer number (20200200039).

Almost surely, 2^40400400077 is an apocalyptic number.

It is an amenable number.

40400400077 is a deficient number, since it is larger than the sum of its proper divisors (1).

40400400077 is an equidigital number, since it uses as much as digits as its factorization.

40400400077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 26.

The spelling of 40400400077 in words is "forty billion, four hundred million, four hundred thousand, seventy-seven".