78387983 has 2 divisors, whose sum is σ = 78387984. Its totient is φ = 78387982.

The previous prime is 78387973. The next prime is 78387997. The reversal of 78387983 is 38978387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78387983 - 2⁶ = 78387919 is a prime.

It is a super-2 number, since 2×78387983² = 12289351757616578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78387913) 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 as a sum of consecutive naturals, namely, 39193991 + 39193992.

It is an arithmetic number, because the mean of its divisors is an integer number (39193992).

Almost surely, 2^78387983 is an apocalyptic number.

78387983 is a deficient number, since it is larger than the sum of its proper divisors (1).

78387983 is an equidigital number, since it uses as much as digits as its factorization.

78387983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 53.

The square root of 78387983 is about 8853.6988315619. The cubic root of 78387983 is about 427.9731236945.

The spelling of 78387983 in words is "seventy-eight million, three hundred eighty-seven thousand, nine hundred eighty-three".