3945386133 has 18 divisors (see below), whose sum is σ = 6138324374. Its totient is φ = 2427511824.

The previous prime is 3945386131. The next prime is 3945386173. The reversal of 3945386133 is 3316835493.

3945386133 is a `hidden beast` number, since 394 + 53 + 86 + 133 = 666.

3945386133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2731421169 + 1213964964 = 52263^2 + 34842^2 .

It is not a de Polignac number, because 3945386133 - 2¹ = 3945386131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945386131) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 676516 + ... + 682322.

Almost surely, 2^3945386133 is an apocalyptic number.

It is an amenable number.

3945386133 is a deficient number, since it is larger than the sum of its proper divisors (2192938241).

3945386133 is an frugal number, since it uses more digits than its factorization.

3945386133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11633 (or 5823 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 3945386133 is about 62812.3087698582. The cubic root of 3945386133 is about 1580.1434112469.

The spelling of 3945386133 in words is "three billion, nine hundred forty-five million, three hundred eighty-six thousand, one hundred thirty-three".