16001865 has 24 divisors (see below), whose sum is σ = 30259008. Its totient is φ = 7758240.

The previous prime is 16001863. The next prime is 16001893. The reversal of 16001865 is 56810061.

16001865 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 not a de Polignac number, because 16001865 - 2¹ = 16001863 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16001863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15669 + ... + 16658.

It is an arithmetic number, because the mean of its divisors is an integer number (1260792).

Almost surely, 2^16001865 is an apocalyptic number.

16001865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16001865 is a deficient number, since it is larger than the sum of its proper divisors (14257143).

16001865 is a wasteful number, since it uses less digits than its factorization.

16001865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32349 (or 32346 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 16001865 is about 4000.2331182070. The cubic root of 16001865 is about 251.9940002351.

The spelling of 16001865 in words is "sixteen million, one thousand, eight hundred sixty-five".