1017978039 has 24 divisors (see below), whose sum is σ = 1638131040. Its totient is φ = 604844352.

The previous prime is 1017978019. The next prime is 1017978083. The reversal of 1017978039 is 9308797101.

It is a de Polignac number, because none of the positive numbers 2^k-1017978039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1017977985 and 1017978003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1017978019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146619 + ... + 153404.

It is an arithmetic number, because the mean of its divisors is an integer number (68255460).

Almost surely, 2^1017978039 is an apocalyptic number.

1017978039 is a deficient number, since it is larger than the sum of its proper divisors (620153001).

1017978039 is a wasteful number, since it uses less digits than its factorization.

1017978039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300071 (or 300068 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 1017978039 is about 31905.7681148723. The cubic root of 1017978039 is about 1005.9571218980.

The spelling of 1017978039 in words is "one billion, seventeen million, nine hundred seventy-eight thousand, thirty-nine".