3857138644 has 12 divisors (see below), whose sum is σ = 6815527264. Its totient is φ = 1909845144.

The previous prime is 3857138603. The next prime is 3857138647. The reversal of 3857138644 is 4468317583.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857138647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4680582 + ... + 4681405.

Almost surely, 2^3857138644 is an apocalyptic number.

It is an amenable number.

3857138644 is a deficient number, since it is larger than the sum of its proper divisors (2958388620).

3857138644 is a wasteful number, since it uses less digits than its factorization.

3857138644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9362094 (or 9362092 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

The square root of 3857138644 is about 62105.8664217802. The cubic root of 3857138644 is about 1568.2733047173.

The spelling of 3857138644 in words is "three billion, eight hundred fifty-seven million, one hundred thirty-eight thousand, six hundred forty-four".