781960939 has 2 divisors, whose sum is σ = 781960940. Its totient is φ = 781960938.

The previous prime is 781960937. The next prime is 781960943. The reversal of 781960939 is 939069187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 781960939 - 2¹ = 781960937 is a prime.

It is a super-2 number, since 2×781960939² = 1222925820243523442, which contains 22 as substring.

Together with 781960937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (781960931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390980469 + 390980470.

It is an arithmetic number, because the mean of its divisors is an integer number (390980470).

Almost surely, 2^781960939 is an apocalyptic number.

781960939 is a deficient number, since it is larger than the sum of its proper divisors (1).

781960939 is an equidigital number, since it uses as much as digits as its factorization.

781960939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 781960939 is about 27963.5644902434. The cubic root of 781960939 is about 921.2871629377.

The spelling of 781960939 in words is "seven hundred eighty-one million, nine hundred sixty thousand, nine hundred thirty-nine".