16398140 has 48 divisors (see below), whose sum is σ = 39553920. Its totient is φ = 5647680.

The previous prime is 16398139. The next prime is 16398157. The reversal of 16398140 is 4189361.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16398097 and 16398106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2219 + ... + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (824040).

Almost surely, 2^16398140 is an apocalyptic number.

16398140 is a gapful number since it is divisible by the number (10) 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 16398140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19776960).

16398140 is an abundant number, since it is smaller than the sum of its proper divisors (23155780).

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

16398140 is a wasteful number, since it uses less digits than its factorization.

16398140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962 (or 3960 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 16398140 is about 4049.4616926204. The cubic root of 16398140 is about 254.0572132263.

It can be divided in two parts, 1639 and 8140, that added together give a palindrome (9779).

The spelling of 16398140 in words is "sixteen million, three hundred ninety-eight thousand, one hundred forty".