39789921607 has 2 divisors, whose sum is σ = 39789921608. Its totient is φ = 39789921606.

The previous prime is 39789921551. The next prime is 39789921649. The reversal of 39789921607 is 70612998793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39789921607 is a prime.

It is a super-2 number, since 2×39789921607² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39789921107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19894960803 + 19894960804.

It is an arithmetic number, because the mean of its divisors is an integer number (19894960804).

Almost surely, 2^39789921607 is an apocalyptic number.

39789921607 is a deficient number, since it is larger than the sum of its proper divisors (1).

39789921607 is an equidigital number, since it uses as much as digits as its factorization.

39789921607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The spelling of 39789921607 in words is "thirty-nine billion, seven hundred eighty-nine million, nine hundred twenty-one thousand, six hundred seven".