3861989 has 2 divisors, whose sum is σ = 3861990. Its totient is φ = 3861988.

The previous prime is 3861983. The next prime is 3862003. The reversal of 3861989 is 9891683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2748964 + 1113025 = 1658^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 3861989 - 2¹⁶ = 3796453 is a prime.

It is a super-2 number, since 2×3861989² = 29829918072242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3861983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930994 + 1930995.

It is an arithmetic number, because the mean of its divisors is an integer number (1930995).

Almost surely, 2^3861989 is an apocalyptic number.

It is an amenable number.

3861989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3861989 is an equidigital number, since it uses as much as digits as its factorization.

3861989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 3861989 is about 1965.1943924203. The cubic root of 3861989 is about 156.8930397819.

The spelling of 3861989 in words is "three million, eight hundred sixty-one thousand, nine hundred eighty-nine".