138020266 has 4 divisors (see below), whose sum is σ = 207030402. Its totient is φ = 69010132.

The previous prime is 138020261. The next prime is 138020273. The reversal of 138020266 is 662020831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 79727041 + 58293225 = 8929^2 + 7635^2 .

It is not an unprimeable number, because it can be changed into a prime (138020261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34505065 + ... + 34505068.

Almost surely, 2^138020266 is an apocalyptic number.

138020266 is a deficient number, since it is larger than the sum of its proper divisors (69010136).

138020266 is an equidigital number, since it uses as much as digits as its factorization.

138020266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69010135.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 138020266 is about 11748.2026710472. The cubic root of 138020266 is about 516.7902205150.

The spelling of 138020266 in words is "one hundred thirty-eight million, twenty thousand, two hundred sixty-six".