39042993649 has 45 divisors (see below), whose sum is σ = 45536710345. Its totient is φ = 33472254200.

The previous prime is 39042993641. The next prime is 39042993707. The reversal of 39042993649 is 94639924093.

The square root of 39042993649 is 197593.

It is a perfect power (a square), and thus also a powerful number.

39042993649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39042993649 - 2³ = 39042993641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39042993593 and 39042993602.

It is not an unprimeable number, because it can be changed into a prime (39042993641) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 549901284 + ... + 549901354.

Almost surely, 2^39042993649 is an apocalyptic number.

39042993649 is the 197593-rd square number.

39042993649 is the 98797-th centered octagonal number.

It is an amenable number.

39042993649 is a deficient number, since it is larger than the sum of its proper divisors (6493716696).

39042993649 is an frugal number, since it uses more digits than its factorization.

39042993649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 58.

The spelling of 39042993649 in words is "thirty-nine billion, forty-two million, nine hundred ninety-three thousand, six hundred forty-nine".