39878081 has 4 divisors (see below), whose sum is σ = 39896064. Its totient is φ = 39860100.

The previous prime is 39878053. The next prime is 39878087. The reversal of 39878081 is 18087893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18087893 = 53 ⋅341281.

It is a cyclic number.

It is not a de Polignac number, because 39878081 - 2¹⁴ = 39861697 is a prime.

It is a super-2 number, since 2×39878081² = 3180522688485122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39878087) 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, 5105 + ... + 10286.

It is an arithmetic number, because the mean of its divisors is an integer number (9974016).

Almost surely, 2^39878081 is an apocalyptic number.

It is an amenable number.

39878081 is a deficient number, since it is larger than the sum of its proper divisors (17983).

39878081 is a wasteful number, since it uses less digits than its factorization.

39878081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17982.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 39878081 is about 6314.9094213615. The cubic root of 39878081 is about 341.6473714531.

The spelling of 39878081 in words is "thirty-nine million, eight hundred seventy-eight thousand, eighty-one".