39099985 has 4 divisors (see below), whose sum is σ = 46919988. Its totient is φ = 31279984.

The previous prime is 39099953. The next prime is 39099989. The reversal of 39099985 is 58999093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58999093 = 911 ⋅64763.

It can be written as a sum of positive squares in 2 ways, for example, as 24285184 + 14814801 = 4928^2 + 3849^2 .

It is a cyclic number.

It is not a de Polignac number, because 39099985 - 2⁵ = 39099953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39099989) 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, 3909994 + ... + 3910003.

It is an arithmetic number, because the mean of its divisors is an integer number (11729997).

Almost surely, 2^39099985 is an apocalyptic number.

It is an amenable number.

39099985 is a deficient number, since it is larger than the sum of its proper divisors (7820003).

39099985 is an equidigital number, since it uses as much as digits as its factorization.

39099985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7820002.

The product of its (nonzero) digits is 787320, while the sum is 52.

The square root of 39099985 is about 6252.9980809209. The cubic root of 39099985 is about 339.4107006501.

The spelling of 39099985 in words is "thirty-nine million, ninety-nine thousand, nine hundred eighty-five".