39621641 has 2 divisors, whose sum is σ = 39621642. Its totient is φ = 39621640.

The previous prime is 39621629. The next prime is 39621667. The reversal of 39621641 is 14612693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 246016 = 6275^2 + 496^2 .

It is an emirp because it is prime and its reverse (14612693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39621641 - 2¹⁰ = 39620617 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 39621598 and 39621607.

It is not a weakly prime, because it can be changed into another prime (39621601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19810820 + 19810821.

It is an arithmetic number, because the mean of its divisors is an integer number (19810821).

Almost surely, 2^39621641 is an apocalyptic number.

It is an amenable number.

39621641 is a deficient number, since it is larger than the sum of its proper divisors (1).

39621641 is an equidigital number, since it uses as much as digits as its factorization.

39621641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 39621641 is about 6294.5723444885. The cubic root of 39621641 is about 340.9134634774.

The spelling of 39621641 in words is "thirty-nine million, six hundred twenty-one thousand, six hundred forty-one".