39240454621 has 2 divisors, whose sum is σ = 39240454622. Its totient is φ = 39240454620.

The previous prime is 39240454597. The next prime is 39240454679. The reversal of 39240454621 is 12645404293.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27287405721 + 11953048900 = 165189^2 + 109330^2 .

It is a cyclic number.

It is not a de Polignac number, because 39240454621 - 2¹⁹ = 39239930333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39240452621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19620227310 + 19620227311.

It is an arithmetic number, because the mean of its divisors is an integer number (19620227311).

Almost surely, 2^39240454621 is an apocalyptic number.

It is an amenable number.

39240454621 is a deficient number, since it is larger than the sum of its proper divisors (1).

39240454621 is an equidigital number, since it uses as much as digits as its factorization.

39240454621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 39240454621 in words is "thirty-nine billion, two hundred forty million, four hundred fifty-four thousand, six hundred twenty-one".