3138209 has 2 divisors, whose sum is σ = 3138210. Its totient is φ = 3138208.

The previous prime is 3138193. The next prime is 3138221. The reversal of 3138209 is 9028313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2608225 + 529984 = 1615^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 3138209 - 2⁴ = 3138193 is a prime.

It is not a weakly prime, because it can be changed into another prime (3138299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569104 + 1569105.

It is an arithmetic number, because the mean of its divisors is an integer number (1569105).

Almost surely, 2^3138209 is an apocalyptic number.

It is an amenable number.

3138209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138209 is an equidigital number, since it uses as much as digits as its factorization.

3138209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 3138209 is about 1771.4990826980. The cubic root of 3138209 is about 146.4065885585.

The spelling of 3138209 in words is "three million, one hundred thirty-eight thousand, two hundred nine".