3969781356 has 48 divisors (see below), whose sum is σ = 9655229696. Its totient is φ = 1268270784.

The previous prime is 3969781339. The next prime is 3969781369. The reversal of 3969781356 is 6531879693.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3969781296 and 3969781305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36976 + ... + 96471.

Almost surely, 2^3969781356 is an apocalyptic number.

It is an amenable number.

3969781356 is an abundant number, since it is smaller than the sum of its proper divisors (5685448340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3969781356 is a wasteful number, since it uses less digits than its factorization.

3969781356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133558 (or 133556 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 57.

The square root of 3969781356 is about 63006.2009329241. The cubic root of 3969781356 is about 1583.3935175005.

The spelling of 3969781356 in words is "three billion, nine hundred sixty-nine million, seven hundred eighty-one thousand, three hundred fifty-six".