3945722571 has 64 divisors (see below), whose sum is σ = 7274880000. Its totient is φ = 2062319616.

The previous prime is 3945722567. The next prime is 3945722579. The reversal of 3945722571 is 1752275493.

It is a happy number.

3945722571 is a `hidden beast` number, since 3 + 9 + 4 + 5 + 72 + 2 + 571 = 666.

It is not a de Polignac number, because 3945722571 - 2² = 3945722567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3945722579) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85195 + ... + 123083.

It is an arithmetic number, because the mean of its divisors is an integer number (113670000).

Almost surely, 2^3945722571 is an apocalyptic number.

3945722571 is a deficient number, since it is larger than the sum of its proper divisors (3329157429).

3945722571 is a wasteful number, since it uses less digits than its factorization.

3945722571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37953 (or 37947 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 3945722571 is about 62814.9868343535. The cubic root of 3945722571 is about 1580.1883249056.

The spelling of 3945722571 in words is "three billion, nine hundred forty-five million, seven hundred twenty-two thousand, five hundred seventy-one".