3989987772 has 48 divisors (see below), whose sum is σ = 9389089920. Its totient is φ = 1318719168.

The previous prime is 3989987761. The next prime is 3989987797. The reversal of 3989987772 is 2777899893.

It is a junction number, because it is equal to n+sod(n) for n = 3989987697 and 3989987706.

It is a congruent number.

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, 2472838 + ... + 2474450.

It is an arithmetic number, because the mean of its divisors is an integer number (195606040).

Almost surely, 2^3989987772 is an apocalyptic number.

It is an amenable number.

3989987772 is an abundant number, since it is smaller than the sum of its proper divisors (5399102148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3989987772 is a wasteful number, since it uses less digits than its factorization.

3989987772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242 (or 3240 counting only the distinct ones).

The product of its digits is 96018048, while the sum is 69.

The square root of 3989987772 is about 63166.3499974472. The cubic root of 3989987772 is about 1586.0754935979.

The spelling of 3989987772 in words is "three billion, nine hundred eighty-nine million, nine hundred eighty-seven thousand, seven hundred seventy-two".