16389587840 has 32 divisors (see below), whose sum is σ = 39181359960. Its totient is φ = 6555834880.

The previous prime is 16389587839. The next prime is 16389587843. The reversal of 16389587840 is 4878598361.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 16389587840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16389587843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12803726 + ... + 12805005.

Almost surely, 2^16389587840 is an apocalyptic number.

16389587840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16389587840 is an abundant number, since it is smaller than the sum of its proper divisors (22791772120).

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

16389587840 is an equidigital number, since it uses as much as digits as its factorization.

16389587840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25608750 (or 25608738 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 16389587840 in words is "sixteen billion, three hundred eighty-nine million, five hundred eighty-seven thousand, eight hundred forty".