39750005 has 4 divisors (see below), whose sum is σ = 47700012. Its totient is φ = 31800000.

The previous prime is 39749971. The next prime is 39750013. The reversal of 39750005 is 50005793.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27646564 + 12103441 = 5258^2 + 3479^2 .

It is a de Polignac number, because none of the positive numbers 2^k-39750005 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39750005.

It is a congruent number.

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, 3974996 + ... + 3975005.

It is an arithmetic number, because the mean of its divisors is an integer number (11925003).

Almost surely, 2^39750005 is an apocalyptic number.

It is an amenable number.

39750005 is a deficient number, since it is larger than the sum of its proper divisors (7950007).

39750005 is an equidigital number, since it uses as much as digits as its factorization.

39750005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7950006.

The product of its (nonzero) digits is 4725, while the sum is 29.

The square root of 39750005 is about 6304.7605029850. The cubic root of 39750005 is about 341.2812241373.

Adding to 39750005 its reverse (50005793), we get a palindrome (89755798).

The spelling of 39750005 in words is "thirty-nine million, seven hundred fifty thousand, five".