16520039 has 4 divisors (see below), whose sum is σ = 17491824. Its totient is φ = 15548256.

The previous prime is 16520027. The next prime is 16520099. The reversal of 16520039 is 93002561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16520039 - 2¹² = 16515943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485867 + ... + 485900.

It is an arithmetic number, because the mean of its divisors is an integer number (4372956).

Almost surely, 2^16520039 is an apocalyptic number.

16520039 is a deficient number, since it is larger than the sum of its proper divisors (971785).

16520039 is an equidigital number, since it uses as much as digits as its factorization.

16520039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971784.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 16520039 is about 4064.4850842388. The cubic root of 16520039 is about 254.6851888508.

The spelling of 16520039 in words is "sixteen million, five hundred twenty thousand, thirty-nine".