3990389697 has 16 divisors (see below), whose sum is σ = 6756215680. Its totient is φ = 2280222576.

The previous prime is 3990389693. The next prime is 3990389699. The reversal of 3990389697 is 7969830993.

3990389697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3990389697 - 2² = 3990389693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990389693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10556398 + ... + 10556775.

It is an arithmetic number, because the mean of its divisors is an integer number (422263480).

Almost surely, 2^3990389697 is an apocalyptic number.

It is an amenable number.

3990389697 is a deficient number, since it is larger than the sum of its proper divisors (2765825983).

3990389697 is a wasteful number, since it uses less digits than its factorization.

3990389697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21113189 (or 21113183 counting only the distinct ones).

The product of its (nonzero) digits is 19840464, while the sum is 63.

The square root of 3990389697 is about 63169.5313976604. The cubic root of 3990389697 is about 1586.1287487309.

It can be divided in two parts, 39903 and 89697, that added together give a square (129600 = 360²).

The spelling of 3990389697 in words is "three billion, nine hundred ninety million, three hundred eighty-nine thousand, six hundred ninety-seven".