39142505 has 4 divisors (see below), whose sum is σ = 46971012. Its totient is φ = 31314000.

The previous prime is 39142501. The next prime is 39142511. The reversal of 39142505 is 50524193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50524193 = 593 ⋅85201.

It can be written as a sum of positive squares in 2 ways, for example, as 7118224 + 32024281 = 2668^2 + 5659^2 .

It is not a de Polignac number, because 39142505 - 2² = 39142501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39142501) 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 3 ways as a sum of consecutive naturals, for example, 3914246 + ... + 3914255.

It is an arithmetic number, because the mean of its divisors is an integer number (11742753).

Almost surely, 2^39142505 is an apocalyptic number.

It is an amenable number.

39142505 is a deficient number, since it is larger than the sum of its proper divisors (7828507).

39142505 is an equidigital number, since it uses as much as digits as its factorization.

39142505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7828506.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 39142505 is about 6256.3971261422. The cubic root of 39142505 is about 339.5336888882.

Adding to 39142505 its reverse (50524193), we get a palindrome (89666698).

The spelling of 39142505 in words is "thirty-nine million, one hundred forty-two thousand, five hundred five".