1938275309 has 2 divisors, whose sum is σ = 1938275310. Its totient is φ = 1938275308.

The previous prime is 1938275299. The next prime is 1938275333. The reversal of 1938275309 is 9035728391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1900698409 + 37576900 = 43597^2 + 6130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938275309 is a prime.

It is a super-2 number, since 2×1938275309² = 7513822346958090962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938275359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969137654 + 969137655.

It is an arithmetic number, because the mean of its divisors is an integer number (969137655).

Almost surely, 2^1938275309 is an apocalyptic number.

It is an amenable number.

1938275309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938275309 is an equidigital number, since it uses as much as digits as its factorization.

1938275309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 1938275309 is about 44025.8481917157. The cubic root of 1938275309 is about 1246.8240031898.

The spelling of 1938275309 in words is "one billion, nine hundred thirty-eight million, two hundred seventy-five thousand, three hundred nine".