39216505 has 8 divisors (see below), whose sum is σ = 47332872. Its totient is φ = 31191168.

The previous prime is 39216503. The next prime is 39216517. The reversal of 39216505 is 50561293.

It can be written as a sum of positive squares in 4 ways, for example, as 14891881 + 24324624 = 3859^2 + 4932^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 39216505 - 2¹ = 39216503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39216503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21804 + ... + 23533.

It is an arithmetic number, because the mean of its divisors is an integer number (5916609).

Almost surely, 2^39216505 is an apocalyptic number.

It is an amenable number.

39216505 is a deficient number, since it is larger than the sum of its proper divisors (8116367).

39216505 is a wasteful number, since it uses less digits than its factorization.

39216505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45515.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 39216505 is about 6262.3082804985. The cubic root of 39216505 is about 339.7475201704.

Adding to 39216505 its reverse (50561293), we get a palindrome (89777798).

The spelling of 39216505 in words is "thirty-nine million, two hundred sixteen thousand, five hundred five".