3856951978 has 8 divisors (see below), whose sum is σ = 6311376000. Its totient is φ = 1753159980.

The previous prime is 3856951939. The next prime is 3856951999. The reversal of 3856951978 is 8791596583.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×3856951978² = 29752157121196224968, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 87657978 + ... + 87658021.

It is an arithmetic number, because the mean of its divisors is an integer number (788922000).

Almost surely, 2^3856951978 is an apocalyptic number.

3856951978 is a deficient number, since it is larger than the sum of its proper divisors (2454424022).

3856951978 is a wasteful number, since it uses less digits than its factorization.

3856951978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175316012.

The product of its digits is 16329600, while the sum is 61.

The square root of 3856951978 is about 62104.3635987038. The cubic root of 3856951978 is about 1568.2480054775.

The spelling of 3856951978 in words is "three billion, eight hundred fifty-six million, nine hundred fifty-one thousand, nine hundred seventy-eight".