1806938249 has 2 divisors, whose sum is σ = 1806938250. Its totient is φ = 1806938248.

The previous prime is 1806938219. The next prime is 1806938251. The reversal of 1806938249 is 9428396081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1302127225 + 504811024 = 36085^2 + 22468^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806938249 - 2²⁴ = 1790161033 is a prime.

Together with 1806938251, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1806938197 and 1806938206.

It is not a weakly prime, because it can be changed into another prime (1806938219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 903469124 + 903469125.

It is an arithmetic number, because the mean of its divisors is an integer number (903469125).

Almost surely, 2^1806938249 is an apocalyptic number.

It is an amenable number.

1806938249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806938249 is an equidigital number, since it uses as much as digits as its factorization.

1806938249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 1806938249 is about 42508.0962758861. The cubic root of 1806938249 is about 1218.0013519596.

The spelling of 1806938249 in words is "one billion, eight hundred six million, nine hundred thirty-eight thousand, two hundred forty-nine".