39661087 has 2 divisors, whose sum is σ = 39661088. Its totient is φ = 39661086.

The previous prime is 39661073. The next prime is 39661099. The reversal of 39661087 is 78016693.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39661087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39661057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19830543 + 19830544.

It is an arithmetic number, because the mean of its divisors is an integer number (19830544).

Almost surely, 2^39661087 is an apocalyptic number.

39661087 is a deficient number, since it is larger than the sum of its proper divisors (1).

39661087 is an equidigital number, since it uses as much as digits as its factorization.

39661087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 39661087 is about 6297.7048994058. The cubic root of 39661087 is about 341.0265600236.

The spelling of 39661087 in words is "thirty-nine million, six hundred sixty-one thousand, eighty-seven".