3989055840 has 384 divisors, whose sum is σ = 16095034368. Its totient is φ = 806215680.

The previous prime is 3989055799. The next prime is 3989055841. The reversal of 3989055840 is 485509893.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989055841) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1366062 + ... + 1368978.

It is an arithmetic number, because the mean of its divisors is an integer number (41914152).

Almost surely, 2^3989055840 is an apocalyptic number.

3989055840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3989055840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8047517184).

3989055840 is an abundant number, since it is smaller than the sum of its proper divisors (12105978528).

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

3989055840 is a wasteful number, since it uses less digits than its factorization.

3989055840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990 (or 2982 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 51.

The square root of 3989055840 is about 63158.9727592208. The cubic root of 3989055840 is about 1585.9519986829.

The spelling of 3989055840 in words is "three billion, nine hundred eighty-nine million, fifty-five thousand, eight hundred forty".