4001389840 has 80 divisors (see below), whose sum is σ = 10998938880. Its totient is φ = 1324592640.

The previous prime is 4001389837. The next prime is 4001389849. The reversal of 4001389840 is 489831004.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×4001389840² = 32022241303310451200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4001389840.

It is not an unprimeable number, because it can be changed into a prime (4001389849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106956 + ... + 139435.

It is an arithmetic number, because the mean of its divisors is an integer number (137486736).

Almost surely, 2^4001389840 is an apocalyptic number.

4001389840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4001389840 is an abundant number, since it is smaller than the sum of its proper divisors (6997549040).

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

4001389840 is a wasteful number, since it uses less digits than its factorization.

4001389840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246440 (or 246434 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 4001389840 is about 63256.5398990492. The cubic root of 4001389840 is about 1587.5848834683.

The spelling of 4001389840 in words is "four billion, one million, three hundred eighty-nine thousand, eight hundred forty".