3989705411978 has 32 divisors (see below), whose sum is σ = 7040272643712. Its totient is φ = 1671749150400.

The previous prime is 3989705411947. The next prime is 3989705412019. The reversal of 3989705411978 is 8791145079893.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9175133 + ... + 9600128.

It is an arithmetic number, because the mean of its divisors is an integer number (220008520116).

Almost surely, 2^{3989705411978} is an apocalyptic number.

3989705411978 is a deficient number, since it is larger than the sum of its proper divisors (3050567231734).

3989705411978 is a wasteful number, since it uses less digits than its factorization.

3989705411978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18776030.

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 3989705411978 in words is "three trillion, nine hundred eighty-nine billion, seven hundred five million, four hundred eleven thousand, nine hundred seventy-eight".