16399552 has 56 divisors (see below), whose sum is σ = 36612576. Its totient is φ = 7231488.

The previous prime is 16399541. The next prime is 16399561. The reversal of 16399552 is 25599361.

It is a happy number.

16399552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18708 + ... + 19564.

It is an arithmetic number, because the mean of its divisors is an integer number (653796).

Almost surely, 2^16399552 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 16399552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18306288).

16399552 is an abundant number, since it is smaller than the sum of its proper divisors (20213024).

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

16399552 is a wasteful number, since it uses less digits than its factorization.

16399552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 895 counting only the distinct ones).

The product of its digits is 72900, while the sum is 40.

The square root of 16399552 is about 4049.6360330282. The cubic root of 16399552 is about 254.0645050795.

The spelling of 16399552 in words is "sixteen million, three hundred ninety-nine thousand, five hundred fifty-two".