3965645042 has 4 divisors (see below), whose sum is σ = 5948467566. Its totient is φ = 1982822520.

The previous prime is 3965645017. The next prime is 3965645077. The reversal of 3965645042 is 2405465693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2405465693 = 229 ⋅10504217.

It can be written as a sum of positive squares in only one way, i.e., 3078141361 + 887503681 = 55481^2 + 29791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3965644984 and 3965645002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991411259 + ... + 991411262.

Almost surely, 2^3965645042 is an apocalyptic number.

3965645042 is a deficient number, since it is larger than the sum of its proper divisors (1982822524).

3965645042 is a wasteful number, since it uses less digits than its factorization.

3965645042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982822523.

The product of its (nonzero) digits is 777600, while the sum is 44.

The square root of 3965645042 is about 62973.3677200132. The cubic root of 3965645042 is about 1582.8433873864.

The spelling of 3965645042 in words is "three billion, nine hundred sixty-five million, six hundred forty-five thousand, forty-two".