4199861 has 2 divisors, whose sum is σ = 4199862. Its totient is φ = 4199860.

The previous prime is 4199851. The next prime is 4199887. The reversal of 4199861 is 1689914.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4120900 + 78961 = 2030^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 4199861 - 2¹⁰ = 4198837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4199801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2099930 + 2099931.

It is an arithmetic number, because the mean of its divisors is an integer number (2099931).

Almost surely, 2^4199861 is an apocalyptic number.

4199861 is the 917-th centered decagonal number.

It is an amenable number.

4199861 is a deficient number, since it is larger than the sum of its proper divisors (1).

4199861 is an equidigital number, since it uses as much as digits as its factorization.

4199861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 4199861 is about 2049.3562403838. The cubic root of 4199861 is about 161.3410846893.

The spelling of 4199861 in words is "four million, one hundred ninety-nine thousand, eight hundred sixty-one".