3857221139 has 4 divisors (see below), whose sum is σ = 3866171040. Its totient is φ = 3848271240.

The previous prime is 3857221133. The next prime is 3857221153. The reversal of 3857221139 is 9311227583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9311227583 = 7 ⋅1330175369.

It is a cyclic number.

It is not a de Polignac number, because 3857221139 - 2⁸ = 3857220883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3857221096 and 3857221105.

It is not an unprimeable number, because it can be changed into a prime (3857221133) 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, 4474304 + ... + 4475165.

It is an arithmetic number, because the mean of its divisors is an integer number (966542760).

Almost surely, 2^3857221139 is an apocalyptic number.

3857221139 is a deficient number, since it is larger than the sum of its proper divisors (8949901).

3857221139 is an equidigital number, since it uses as much as digits as its factorization.

3857221139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8949900.

The product of its digits is 90720, while the sum is 41.

The square root of 3857221139 is about 62106.5305664388. The cubic root of 3857221139 is about 1568.2844851800.

The spelling of 3857221139 in words is "three billion, eight hundred fifty-seven million, two hundred twenty-one thousand, one hundred thirty-nine".