3857867989 has 2 divisors, whose sum is σ = 3857867990. Its totient is φ = 3857867988.

The previous prime is 3857867969. The next prime is 3857868019. The reversal of 3857867989 is 9897687583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2558842225 + 1299025764 = 50585^2 + 36042^2 .

It is a cyclic number.

It is not a de Polignac number, because 3857867989 - 2⁷ = 3857867861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3857867969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928933994 + 1928933995.

It is an arithmetic number, because the mean of its divisors is an integer number (1928933995).

Almost surely, 2^3857867989 is an apocalyptic number.

It is an amenable number.

3857867989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3857867989 is an equidigital number, since it uses as much as digits as its factorization.

3857867989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 182891520, while the sum is 70.

The square root of 3857867989 is about 62111.7379325357. The cubic root of 3857867989 is about 1568.3721465716.

The spelling of 3857867989 in words is "three billion, eight hundred fifty-seven million, eight hundred sixty-seven thousand, nine hundred eighty-nine".