39920449965 has 16 divisors (see below), whose sum is σ = 69679331136. Its totient is φ = 19355369600.

The previous prime is 39920449957. The next prime is 39920449969. The reversal of 39920449965 is 56994402993.

It is not a de Polignac number, because 39920449965 - 2³ = 39920449957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39920449899 and 39920449908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39920449969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120970896 + ... + 120971225.

It is an arithmetic number, because the mean of its divisors is an integer number (4354958196).

Almost surely, 2^39920449965 is an apocalyptic number.

It is an amenable number.

39920449965 is a deficient number, since it is larger than the sum of its proper divisors (29758881171).

39920449965 is a wasteful number, since it uses less digits than its factorization.

39920449965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241942140.

The product of its (nonzero) digits is 18895680, while the sum is 60.

The spelling of 39920449965 in words is "thirty-nine billion, nine hundred twenty million, four hundred forty-nine thousand, nine hundred sixty-five".