3947789391658 has 48 divisors (see below), whose sum is σ = 7068863850048. Its totient is φ = 1647751896000.

The previous prime is 3947789391653. The next prime is 3947789391659. The reversal of 3947789391658 is 8561939877493.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3947789391653) 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, 1433923 + ... + 3154633.

It is an arithmetic number, because the mean of its divisors is an integer number (147267996876).

Almost surely, 2^{3947789391658} is an apocalyptic number.

3947789391658 is a deficient number, since it is larger than the sum of its proper divisors (3121074458390).

3947789391658 is a wasteful number, since it uses less digits than its factorization.

3947789391658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721339 (or 1721332 counting only the distinct ones).

The product of its digits is 2469035520, while the sum is 79.

The spelling of 3947789391658 in words is "three trillion, nine hundred forty-seven billion, seven hundred eighty-nine million, three hundred ninety-one thousand, six hundred fifty-eight".