39884861 has 2 divisors, whose sum is σ = 39884862. Its totient is φ = 39884860.

The previous prime is 39884843. The next prime is 39884863. The reversal of 39884861 is 16848893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33709636 + 6175225 = 5806^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 39884861 - 2¹⁸ = 39622717 is a prime.

Together with 39884863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39884863) 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 as a sum of consecutive naturals, namely, 19942430 + 19942431.

It is an arithmetic number, because the mean of its divisors is an integer number (19942431).

Almost surely, 2^39884861 is an apocalyptic number.

It is an amenable number.

39884861 is a deficient number, since it is larger than the sum of its proper divisors (1).

39884861 is an equidigital number, since it uses as much as digits as its factorization.

39884861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 47.

The square root of 39884861 is about 6315.4462233480. The cubic root of 39884861 is about 341.6667324476. Note that the first 3 decimals are identical.

The spelling of 39884861 in words is "thirty-nine million, eight hundred eighty-four thousand, eight hundred sixty-one".