16438656 has 128 divisors (see below), whose sum is σ = 48837600. Its totient is φ = 4866048.

The previous prime is 16438637. The next prime is 16438657. The reversal of 16438656 is 65683461.

16438656 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×16438656² = 540458822172672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (103680) is a multiple of the sum of its prime divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16438657) 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, 184660 + ... + 184748.

Almost surely, 2^16438656 is an apocalyptic number.

16438656 is a gapful number since it is divisible by the number (16) 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 16438656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24418800).

16438656 is an abundant number, since it is smaller than the sum of its proper divisors (32398944).

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

16438656 is a wasteful number, since it uses less digits than its factorization.

16438656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 144 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 16438656 is about 4054.4612465777. The cubic root of 16438656 is about 254.2662799486.

The spelling of 16438656 in words is "sixteen million, four hundred thirty-eight thousand, six hundred fifty-six".