39078881 has 2 divisors, whose sum is σ = 39078882. Its totient is φ = 39078880.

The previous prime is 39078847. The next prime is 39078887. The reversal of 39078881 is 18887093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27457600 + 11621281 = 5240^2 + 3409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39078881 is a prime.

It is a super-2 number, since 2×39078881² = 3054317880424322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39078887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19539440 + 19539441.

It is an arithmetic number, because the mean of its divisors is an integer number (19539441).

Almost surely, 2^39078881 is an apocalyptic number.

It is an amenable number.

39078881 is a deficient number, since it is larger than the sum of its proper divisors (1).

39078881 is an equidigital number, since it uses as much as digits as its factorization.

39078881 is an evil number, because the sum of its binary digits is even.

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

The square root of 39078881 is about 6251.3103426402. The cubic root of 39078881 is about 339.3496246460.

The spelling of 39078881 in words is "thirty-nine million, seventy-eight thousand, eight hundred eighty-one".