4199989 has 2 divisors, whose sum is σ = 4199990. Its totient is φ = 4199988.

The previous prime is 4199977. The next prime is 4200013. The reversal of 4199989 is 9899914.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3132900 + 1067089 = 1770^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 4199989 - 2⁵ = 4199957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4199929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2099994 + 2099995.

It is an arithmetic number, because the mean of its divisors is an integer number (2099995).

Almost surely, 2^4199989 is an apocalyptic number.

It is an amenable number.

4199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4199989 is an equidigital number, since it uses as much as digits as its factorization.

4199989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 49.

The square root of 4199989 is about 2049.3874694650. The cubic root of 4199989 is about 161.3427237474.

The spelling of 4199989 in words is "four million, one hundred ninety-nine thousand, nine hundred eighty-nine".