1978794359 has 2 divisors, whose sum is σ = 1978794360. Its totient is φ = 1978794358.

The previous prime is 1978794319. The next prime is 1978794421. The reversal of 1978794359 is 9534978791.

It is an a-pointer prime, because the next prime (1978794421) can be obtained adding 1978794359 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978794359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978794319) 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, 989397179 + 989397180.

It is an arithmetic number, because the mean of its divisors is an integer number (989397180).

Almost surely, 2^1978794359 is an apocalyptic number.

1978794359 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978794359 is an equidigital number, since it uses as much as digits as its factorization.

1978794359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17146080, while the sum is 62.

The square root of 1978794359 is about 44483.6414763899. The cubic root of 1978794359 is about 1255.4523131668.

The spelling of 1978794359 in words is "one billion, nine hundred seventy-eight million, seven hundred ninety-four thousand, three hundred fifty-nine".