7839913978 has 16 divisors (see below), whose sum is σ = 12666407040. Its totient is φ = 3617870256.

The previous prime is 7839913957. The next prime is 7839913993. The reversal of 7839913978 is 8793199387.

It is a super-2 number, since 2×7839913978² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187083 + ... + 225121.

It is an arithmetic number, because the mean of its divisors is an integer number (791650440).

Almost surely, 2^7839913978 is an apocalyptic number.

7839913978 is a deficient number, since it is larger than the sum of its proper divisors (4826493062).

7839913978 is a wasteful number, since it uses less digits than its factorization.

7839913978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45981.

The product of its digits is 20575296, while the sum is 64.

The square root of 7839913978 is about 88543.2887236520. The cubic root of 7839913978 is about 1986.5695110301.

The spelling of 7839913978 in words is "seven billion, eight hundred thirty-nine million, nine hundred thirteen thousand, nine hundred seventy-eight".