16039945 has 4 divisors (see below), whose sum is σ = 19247940. Its totient is φ = 12831952.

The previous prime is 16039921. The next prime is 16039957. The reversal of 16039945 is 54993061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54993061 = 83 ⋅662567.

It can be written as a sum of positive squares in 2 ways, for example, as 11532816 + 4507129 = 3396^2 + 2123^2 .

It is a cyclic number.

It is not a de Polignac number, because 16039945 - 2⁵ = 16039913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603990 + ... + 1603999.

It is an arithmetic number, because the mean of its divisors is an integer number (4811985).

Almost surely, 2^16039945 is an apocalyptic number.

It is an amenable number.

16039945 is a deficient number, since it is larger than the sum of its proper divisors (3207995).

16039945 is an equidigital number, since it uses as much as digits as its factorization.

16039945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207994.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 16039945 is about 4004.9900124719. The cubic root of 16039945 is about 252.1937338222.

The spelling of 16039945 in words is "sixteen million, thirty-nine thousand, nine hundred forty-five".