3945742257849 has 64 divisors (see below), whose sum is σ = 6267516710400. Its totient is φ = 2206482888960.

The previous prime is 3945742257803. The next prime is 3945742257953. The reversal of 3945742257849 is 9487522475493.

3945742257849 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 3945742257849 - 2¹⁵ = 3945742225081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3945742357849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12205947 + ... + 12525039.

It is an arithmetic number, because the mean of its divisors is an integer number (97929948600).

Almost surely, 2^{3945742257849} is an apocalyptic number.

It is an amenable number.

3945742257849 is a deficient number, since it is larger than the sum of its proper divisors (2321774452551).

3945742257849 is a wasteful number, since it uses less digits than its factorization.

3945742257849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319375 (or 319361 counting only the distinct ones).

The product of its digits is 609638400, while the sum is 69.

The spelling of 3945742257849 in words is "three trillion, nine hundred forty-five billion, seven hundred forty-two million, two hundred fifty-seven thousand, eight hundred forty-nine".