39904705 has 8 divisors (see below), whose sum is σ = 47948904. Its totient is φ = 31881600.

The previous prime is 39904703. The next prime is 39904771. The reversal of 39904705 is 50740993.

It can be written as a sum of positive squares in 4 ways, for example, as 478864 + 39425841 = 692^2 + 6279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39904705 - 2¹ = 39904703 is a prime.

It is a super-2 number, since 2×39904705² = 3184770962274050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39904703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756 + ... + 8965.

It is an arithmetic number, because the mean of its divisors is an integer number (5993613).

Almost surely, 2^39904705 is an apocalyptic number.

It is an amenable number.

39904705 is a deficient number, since it is larger than the sum of its proper divisors (8044199).

39904705 is an equidigital number, since it uses as much as digits as its factorization.

39904705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10547.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 39904705 is about 6317.0170967000. The cubic root of 39904705 is about 341.7233864457.

The spelling of 39904705 in words is "thirty-nine million, nine hundred four thousand, seven hundred five".