138009769 has 2 divisors, whose sum is σ = 138009770. Its totient is φ = 138009768.

The previous prime is 138009743. The next prime is 138009797. The reversal of 138009769 is 967900831.

138009769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129686544 + 8323225 = 11388^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 138009769 - 2¹¹ = 138007721 is a prime.

It is a super-2 number, since 2×138009769² = 38093392678866722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138009709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69004884 + 69004885.

It is an arithmetic number, because the mean of its divisors is an integer number (69004885).

Almost surely, 2^138009769 is an apocalyptic number.

It is an amenable number.

138009769 is a deficient number, since it is larger than the sum of its proper divisors (1).

138009769 is an equidigital number, since it uses as much as digits as its factorization.

138009769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 138009769 is about 11747.7559133649. The cubic root of 138009769 is about 516.7771188534. Note that the first 3 decimals are identical.

The spelling of 138009769 in words is "one hundred thirty-eight million, nine thousand, seven hundred sixty-nine".