3988904643 has 8 divisors (see below), whose sum is σ = 5909488400. Its totient is φ = 2659269744.

The previous prime is 3988904641. The next prime is 3988904677. The reversal of 3988904643 is 3464098893.

It is a happy number.

3988904643 is a `hidden beast` number, since 3 + 98 + 8 + 90 + 464 + 3 = 666.

It is not a de Polignac number, because 3988904643 - 2¹ = 3988904641 is a prime.

It is a super-2 number, since 2×3988904643² = 31822720501893914898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3988904643.

It is not an unprimeable number, because it can be changed into a prime (3988904641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73868578 + ... + 73868631.

It is an arithmetic number, because the mean of its divisors is an integer number (738686050).

Almost surely, 2^3988904643 is an apocalyptic number.

3988904643 is a deficient number, since it is larger than the sum of its proper divisors (1920583757).

3988904643 is a wasteful number, since it uses less digits than its factorization.

3988904643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147737218 (or 147737212 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The square root of 3988904643 is about 63157.7757920590. The cubic root of 3988904643 is about 1585.9319610079.

The spelling of 3988904643 in words is "three billion, nine hundred eighty-eight million, nine hundred four thousand, six hundred forty-three".