3969395953491 has 32 divisors (see below), whose sum is σ = 5555005682688. Its totient is φ = 2518558997760.

The previous prime is 3969395953487. The next prime is 3969395953493. The reversal of 3969395953491 is 1943595939693.

It is not a de Polignac number, because 3969395953491 - 2² = 3969395953487 is a prime.

It is a super-2 number, since 2×3969395953491² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3969395953493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656481 + ... + 2893053.

It is an arithmetic number, because the mean of its divisors is an integer number (173593927584).

Almost surely, 2^{3969395953491} is an apocalyptic number.

3969395953491 is a deficient number, since it is larger than the sum of its proper divisors (1585609729197).

3969395953491 is a wasteful number, since it uses less digits than its factorization.

3969395953491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236971.

The product of its digits is 956593800, while the sum is 75.

The spelling of 3969395953491 in words is "three trillion, nine hundred sixty-nine billion, three hundred ninety-five million, nine hundred fifty-three thousand, four hundred ninety-one".