3958649136784 has 20 divisors (see below), whose sum is σ = 7718735463484. Its totient is φ = 1966717404288.

The previous prime is 3958649136769. The next prime is 3958649136787. The reversal of 3958649136784 is 4876319468593.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 643409328384 + 3315239808400 = 802128^2 + 1820780^2 .

It is not an unprimeable number, because it can be changed into a prime (3958649136787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787945167 + ... + 787950190.

Almost surely, 2^{3958649136784} is an apocalyptic number.

It is an amenable number.

3958649136784 is a deficient number, since it is larger than the sum of its proper divisors (3760086326700).

3958649136784 is a wasteful number, since it uses less digits than its factorization.

3958649136784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575895522 (or 1575895516 counting only the distinct ones).

The product of its digits is 940584960, while the sum is 73.

The spelling of 3958649136784 in words is "three trillion, nine hundred fifty-eight billion, six hundred forty-nine million, one hundred thirty-six thousand, seven hundred eighty-four".