16139664 has 120 divisors (see below), whose sum is σ = 50487840. Its totient is φ = 4783104.

The previous prime is 16139611. The next prime is 16139671. The reversal of 16139664 is 46693161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46339 + ... + 46685.

It is an arithmetic number, because the mean of its divisors is an integer number (420732).

Almost surely, 2^16139664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16139664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25243920).

16139664 is an abundant number, since it is smaller than the sum of its proper divisors (34348176).

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

16139664 is a wasteful number, since it uses less digits than its factorization.

16139664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 388 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 16139664 is about 4017.4200676554. The cubic root of 16139664 is about 252.7152769823.

The spelling of 16139664 in words is "sixteen million, one hundred thirty-nine thousand, six hundred sixty-four".