39730889621 has 2 divisors, whose sum is σ = 39730889622. Its totient is φ = 39730889620.

The previous prime is 39730889591. The next prime is 39730889623. The reversal of 39730889621 is 12698803793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36601046596 + 3129843025 = 191314^2 + 55945^2 .

It is a cyclic number.

It is not a de Polignac number, because 39730889621 - 2¹⁸ = 39730627477 is a prime.

Together with 39730889623, 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 (39730889623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19865444810 + 19865444811.

It is an arithmetic number, because the mean of its divisors is an integer number (19865444811).

Almost surely, 2^39730889621 is an apocalyptic number.

It is an amenable number.

39730889621 is a deficient number, since it is larger than the sum of its proper divisors (1).

39730889621 is an equidigital number, since it uses as much as digits as its factorization.

39730889621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 39730889621 in words is "thirty-nine billion, seven hundred thirty million, eight hundred eighty-nine thousand, six hundred twenty-one".