39972545 has 8 divisors (see below), whose sum is σ = 48097896. Its totient is φ = 31890816.

The previous prime is 39972529. The next prime is 39972557. The reversal of 39972545 is 54527993.

39972545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 332929 + 39639616 = 577^2 + 6296^2 .

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 39972545 - 2⁴ = 39972529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39972496 and 39972505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8852 + ... + 12581.

It is an arithmetic number, because the mean of its divisors is an integer number (6012237).

Almost surely, 2^39972545 is an apocalyptic number.

It is an amenable number.

39972545 is a deficient number, since it is larger than the sum of its proper divisors (8125351).

39972545 is a wasteful number, since it uses less digits than its factorization.

39972545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21811.

The product of its digits is 340200, while the sum is 44.

The square root of 39972545 is about 6322.3844394342. The cubic root of 39972545 is about 341.9169257772.

The spelling of 39972545 in words is "thirty-nine million, nine hundred seventy-two thousand, five hundred forty-five".