1967678789 has 2 divisors, whose sum is σ = 1967678790. Its totient is φ = 1967678788.

The previous prime is 1967678777. The next prime is 1967678827. The reversal of 1967678789 is 9878767691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1903838689 + 63840100 = 43633^2 + 7990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1967678789 - 2¹⁶ = 1967613253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1967678729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983839394 + 983839395.

It is an arithmetic number, because the mean of its divisors is an integer number (983839395).

Almost surely, 2^1967678789 is an apocalyptic number.

It is an amenable number.

1967678789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1967678789 is an equidigital number, since it uses as much as digits as its factorization.

1967678789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64012032, while the sum is 68.

The square root of 1967678789 is about 44358.5255503381. The cubic root of 1967678789 is about 1253.0971282197.

The spelling of 1967678789 in words is "one billion, nine hundred sixty-seven million, six hundred seventy-eight thousand, seven hundred eighty-nine".