7978971039 has 16 divisors (see below), whose sum is σ = 11468262624. Its totient is φ = 4905302400.

The previous prime is 7978971037. The next prime is 7978971041. The reversal of 7978971039 is 9301798797.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7978971037) and next prime (7978971041).

It is not a de Polignac number, because 7978971039 - 2¹ = 7978971037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978971031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60372 + ... + 140009.

It is an arithmetic number, because the mean of its divisors is an integer number (716766414).

Almost surely, 2^7978971039 is an apocalyptic number.

7978971039 is a deficient number, since it is larger than the sum of its proper divisors (3489291585).

7978971039 is a wasteful number, since it uses less digits than its factorization.

7978971039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201418.

The product of its (nonzero) digits is 6001128, while the sum is 60.

The square root of 7978971039 is about 89325.0862803949. The cubic root of 7978971039 is about 1998.2460488607.

The spelling of 7978971039 in words is "seven billion, nine hundred seventy-eight million, nine hundred seventy-one thousand, thirty-nine".