16438940 has 48 divisors (see below), whose sum is σ = 40824000. Its totient is φ = 5440512.

The previous prime is 16438931. The next prime is 16438967. The reversal of 16438940 is 4983461.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 16438940.

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, 2036 + ... + 6084.

It is an arithmetic number, because the mean of its divisors is an integer number (850500).

Almost surely, 2^16438940 is an apocalyptic number.

16438940 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 16438940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20412000).

16438940 is an abundant number, since it is smaller than the sum of its proper divisors (24385060).

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

16438940 is a wasteful number, since it uses less digits than its factorization.

16438940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4094 (or 4092 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 16438940 is about 4054.4962695753. The cubic root of 16438940 is about 254.2677442048.

The spelling of 16438940 in words is "sixteen million, four hundred thirty-eight thousand, nine hundred forty".