3965969138 has 4 divisors (see below), whose sum is σ = 5948953710. Its totient is φ = 1982984568.

The previous prime is 3965969129. The next prime is 3965969141. The reversal of 3965969138 is 8319695693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8319695693 = 3527 ⋅2358859.

It can be written as a sum of positive squares in only one way, i.e., 3512577289 + 453391849 = 59267^2 + 21293^2 .

It is a super-2 number, since 2×3965969138² = 31457822407136926088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991492283 + ... + 991492286.

Almost surely, 2^3965969138 is an apocalyptic number.

3965969138 is a deficient number, since it is larger than the sum of its proper divisors (1982984572).

3965969138 is a wasteful number, since it uses less digits than its factorization.

3965969138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982984571.

The product of its digits is 9447840, while the sum is 59.

The square root of 3965969138 is about 62975.9409457294. The cubic root of 3965969138 is about 1582.8865059905.

The spelling of 3965969138 in words is "three billion, nine hundred sixty-five million, nine hundred sixty-nine thousand, one hundred thirty-eight".