39878645 has 8 divisors (see below), whose sum is σ = 48204504. Its totient is φ = 31669504.

The previous prime is 39878621. The next prime is 39878669. The reversal of 39878645 is 54687893.

It is an interprime number because it is at equal distance from previous prime (39878621) and next prime (39878669).

It can be written as a sum of positive squares in 4 ways, for example, as 7171684 + 32706961 = 2678^2 + 5719^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39878645 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39878593 and 39878602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28424 + ... + 29793.

It is an arithmetic number, because the mean of its divisors is an integer number (6025563).

Almost surely, 2^39878645 is an apocalyptic number.

It is an amenable number.

39878645 is a deficient number, since it is larger than the sum of its proper divisors (8325859).

39878645 is a wasteful number, since it uses less digits than its factorization.

39878645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58359.

The product of its digits is 1451520, while the sum is 50.

The square root of 39878645 is about 6314.9540774261. The cubic root of 39878645 is about 341.6489820974.

The spelling of 39878645 in words is "thirty-nine million, eight hundred seventy-eight thousand, six hundred forty-five".