1019978039 has 2 divisors, whose sum is σ = 1019978040. Its totient is φ = 1019978038.

The previous prime is 1019978023. The next prime is 1019978041. The reversal of 1019978039 is 9308799101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1019978039 - 2⁴ = 1019978023 is a prime.

Together with 1019978041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1019977984 and 1019978002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019968039) 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, 509989019 + 509989020.

It is an arithmetic number, because the mean of its divisors is an integer number (509989020).

Almost surely, 2^1019978039 is an apocalyptic number.

1019978039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019978039 is an equidigital number, since it uses as much as digits as its factorization.

1019978039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 1019978039 is about 31937.0950307006. The cubic root of 1019978039 is about 1006.6154851810.

The spelling of 1019978039 in words is "one billion, nineteen million, nine hundred seventy-eight thousand, thirty-nine".