3915803961 has 24 divisors (see below), whose sum is σ = 5724056520. Its totient is φ = 2579291136.

The previous prime is 3915803959. The next prime is 3915804001. The reversal of 3915803961 is 1693085193.

3915803961 is a `hidden beast` number, since 3 + 9 + 1 + 580 + 3 + 9 + 61 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 44475561 + 3871328400 = 6669^2 + 62220^2 .

It is not a de Polignac number, because 3915803961 - 2¹ = 3915803959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3915803911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 566635 + ... + 573503.

It is an arithmetic number, because the mean of its divisors is an integer number (238502355).

Almost surely, 2^3915803961 is an apocalyptic number.

It is an amenable number.

3915803961 is a deficient number, since it is larger than the sum of its proper divisors (1808252559).

3915803961 is a wasteful number, since it uses less digits than its factorization.

3915803961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7625 (or 7622 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 3915803961 is about 62576.3850106412. The cubic root of 3915803961 is about 1576.1842389043.

The spelling of 3915803961 in words is "three billion, nine hundred fifteen million, eight hundred three thousand, nine hundred sixty-one".