40784842381 has 2 divisors, whose sum is σ = 40784842382. Its totient is φ = 40784842380.

The previous prime is 40784842313. The next prime is 40784842447. The reversal of 40784842381 is 18324848704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39773920356 + 1010922025 = 199434^2 + 31795^2 .

It is a cyclic number.

It is not a de Polignac number, because 40784842381 - 2¹¹ = 40784840333 is a prime.

It is a super-2 number, since 2×40784842381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40784842181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20392421190 + 20392421191.

It is an arithmetic number, because the mean of its divisors is an integer number (20392421191).

Almost surely, 2^40784842381 is an apocalyptic number.

It is an amenable number.

40784842381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40784842381 is an equidigital number, since it uses as much as digits as its factorization.

40784842381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1376256, while the sum is 49.

The spelling of 40784842381 in words is "forty billion, seven hundred eighty-four million, eight hundred forty-two thousand, three hundred eighty-one".