39971239 has 8 divisors (see below), whose sum is σ = 49834368. Its totient is φ = 31146360.

The previous prime is 39971227. The next prime is 39971297. The reversal of 39971239 is 93217993.

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

It is not a de Polignac number, because 39971239 - 2¹⁵ = 39938471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39971195 and 39971204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39971219) 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, 259477 + ... + 259630.

It is an arithmetic number, because the mean of its divisors is an integer number (6229296).

Almost surely, 2^39971239 is an apocalyptic number.

39971239 is a deficient number, since it is larger than the sum of its proper divisors (9863129).

39971239 is a wasteful number, since it uses less digits than its factorization.

39971239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519125.

The product of its digits is 91854, while the sum is 43.

The square root of 39971239 is about 6322.2811547732. The cubic root of 39971239 is about 341.9132019849.

The spelling of 39971239 in words is "thirty-nine million, nine hundred seventy-one thousand, two hundred thirty-nine".