3869821427 has 2 divisors, whose sum is σ = 3869821428. Its totient is φ = 3869821426.

The previous prime is 3869821411. The next prime is 3869821477. The reversal of 3869821427 is 7241289683.

It is an a-pointer prime, because the next prime (3869821477) can be obtained adding 3869821427 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3869821427 - 2⁴ = 3869821411 is a prime.

It is not a weakly prime, because it can be changed into another prime (3869821477) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1934910713 + 1934910714.

It is an arithmetic number, because the mean of its divisors is an integer number (1934910714).

Almost surely, 2^3869821427 is an apocalyptic number.

3869821427 is a deficient number, since it is larger than the sum of its proper divisors (1).

3869821427 is an equidigital number, since it uses as much as digits as its factorization.

3869821427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The square root of 3869821427 is about 62207.8887843013. Note that the first 3 decimals coincide. The cubic root of 3869821427 is about 1569.9903209811.

The spelling of 3869821427 in words is "three billion, eight hundred sixty-nine million, eight hundred twenty-one thousand, four hundred twenty-seven".