39972047 has 4 divisors (see below), whose sum is σ = 40000416. Its totient is φ = 39943680.

The previous prime is 39972013. The next prime is 39972059. The reversal of 39972047 is 74027993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39972047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39971995 and 39972013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11954 + ... + 14927.

It is an arithmetic number, because the mean of its divisors is an integer number (10000104).

Almost surely, 2^39972047 is an apocalyptic number.

39972047 is a deficient number, since it is larger than the sum of its proper divisors (28369).

39972047 is a wasteful number, since it uses less digits than its factorization.

39972047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28368.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 39972047 is about 6322.3450554363. The cubic root of 39972047 is about 341.9155058415.

The spelling of 39972047 in words is "thirty-nine million, nine hundred seventy-two thousand, forty-seven".