16001388 has 120 divisors (see below), whose sum is σ = 46957680. Its totient is φ = 4717440.

The previous prime is 16001387. The next prime is 16001393. The reversal of 16001388 is 88310061.

16001388 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 Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001383) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 122083 + ... + 122213.

It is an arithmetic number, because the mean of its divisors is an integer number (391314).

Almost surely, 2^16001388 is an apocalyptic number.

16001388 is a gapful number since it is divisible by the number (18) 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 16001388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23478840).

16001388 is an abundant number, since it is smaller than the sum of its proper divisors (30956292).

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

16001388 is a wasteful number, since it uses less digits than its factorization.

16001388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 16001388 is about 4000.1734962374. The cubic root of 16001388 is about 251.9914963117.

The spelling of 16001388 in words is "sixteen million, one thousand, three hundred eighty-eight".