39878863 has 2 divisors, whose sum is σ = 39878864. Its totient is φ = 39878862.

The previous prime is 39878801. The next prime is 39878879. The reversal of 39878863 is 36887893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39878863 - 2⁹ = 39878351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39878863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39878893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19939431 + 19939432.

It is an arithmetic number, because the mean of its divisors is an integer number (19939432).

Almost surely, 2^39878863 is an apocalyptic number.

39878863 is a deficient number, since it is larger than the sum of its proper divisors (1).

39878863 is an equidigital number, since it uses as much as digits as its factorization.

39878863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 39878863 is about 6314.9713380189. The cubic root of 39878863 is about 341.6496046473.

The spelling of 39878863 in words is "thirty-nine million, eight hundred seventy-eight thousand, eight hundred sixty-three".