3857636945 has 4 divisors (see below), whose sum is σ = 4629164340. Its totient is φ = 3086109552.

The previous prime is 3857636929. The next prime is 3857636953. The reversal of 3857636945 is 5496367583.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 943472656 + 2914164289 = 30716^2 + 53983^2 .

It is a cyclic number.

It is not a de Polignac number, because 3857636945 - 2⁴ = 3857636929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385763690 + ... + 385763699.

It is an arithmetic number, because the mean of its divisors is an integer number (1157291085).

Almost surely, 2^3857636945 is an apocalyptic number.

It is an amenable number.

3857636945 is a deficient number, since it is larger than the sum of its proper divisors (771527395).

3857636945 is an equidigital number, since it uses as much as digits as its factorization.

3857636945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771527394.

The product of its digits is 16329600, while the sum is 56.

The square root of 3857636945 is about 62109.8779985921. The cubic root of 3857636945 is about 1568.3408365138.

The spelling of 3857636945 in words is "three billion, eight hundred fifty-seven million, six hundred thirty-six thousand, nine hundred forty-five".