39871345 has 4 divisors (see below), whose sum is σ = 47845620. Its totient is φ = 31897072.

The previous prime is 39871343. The next prime is 39871361. The reversal of 39871345 is 54317893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54317893 = 7 ⋅7759699.

It can be written as a sum of positive squares in 2 ways, for example, as 4397409 + 35473936 = 2097^2 + 5956^2 .

It is a cyclic number.

It is not a de Polignac number, because 39871345 - 2¹ = 39871343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39871298 and 39871307.

It is not an unprimeable number, because it can be changed into a prime (39871343) 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, 3987130 + ... + 3987139.

It is an arithmetic number, because the mean of its divisors is an integer number (11961405).

Almost surely, 2^39871345 is an apocalyptic number.

It is an amenable number.

39871345 is a deficient number, since it is larger than the sum of its proper divisors (7974275).

39871345 is an equidigital number, since it uses as much as digits as its factorization.

39871345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7974274.

The product of its digits is 90720, while the sum is 40.

The square root of 39871345 is about 6314.3760578540. The cubic root of 39871345 is about 341.6281339320.

The spelling of 39871345 in words is "thirty-nine million, eight hundred seventy-one thousand, three hundred forty-five".