16389916840 has 64 divisors (see below), whose sum is σ = 41978943360. Its totient is φ = 5700837120.

The previous prime is 16389916793. The next prime is 16389916843. The reversal of 16389916840 is 4861998361.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (16389916843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799659 + ... + 819898.

It is an arithmetic number, because the mean of its divisors is an integer number (655920990).

Almost surely, 2^16389916840 is an apocalyptic number.

16389916840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16389916840 is an abundant number, since it is smaller than the sum of its proper divisors (25589026520).

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

16389916840 is a wasteful number, since it uses less digits than its factorization.

16389916840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619602 (or 1619598 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 16389916840 in words is "sixteen billion, three hundred eighty-nine million, nine hundred sixteen thousand, eight hundred forty".