3988734644 has 6 divisors (see below), whose sum is σ = 6980285634. Its totient is φ = 1994367320.

The previous prime is 3988734641. The next prime is 3988734649. The reversal of 3988734644 is 4464378893.

It can be written as a sum of positive squares in only one way, i.e., 2844942244 + 1143792400 = 53338^2 + 33820^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3988734644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988734641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498591827 + ... + 498591834.

It is an arithmetic number, because the mean of its divisors is an integer number (1163380939).

Almost surely, 2^3988734644 is an apocalyptic number.

It is an amenable number.

3988734644 is a deficient number, since it is larger than the sum of its proper divisors (2991550990).

3988734644 is a wasteful number, since it uses less digits than its factorization.

3988734644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997183665 (or 997183663 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 56.

The square root of 3988734644 is about 63156.4299497684. The cubic root of 3988734644 is about 1585.9094309567.

The spelling of 3988734644 in words is "three billion, nine hundred eighty-eight million, seven hundred thirty-four thousand, six hundred forty-four".