138769 has 4 divisors (see below), whose sum is σ = 139840. Its totient is φ = 137700.

The previous prime is 138763. The next prime is 138793. The reversal of 138769 is 967831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 138769 - 2⁷ = 138641 is a prime.

It is a super-2 number, since 2×138769² = 38513670722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309 + ... + 610.

It is an arithmetic number, because the mean of its divisors is an integer number (34960).

2¹³⁸⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

138769 is a deficient number, since it is larger than the sum of its proper divisors (1071).

138769 is an equidigital number, since it uses as much as digits as its factorization.

138769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070.

The product of its digits is 9072, while the sum is 34.

The square root of 138769 is about 372.5171137008. The cubic root of 138769 is about 51.7723032369.

It can be divided in two parts, 1387 and 69, that multiplied together give a triangular number (95703 = T₄₃₇).

The spelling of 138769 in words is "one hundred thirty-eight thousand, seven hundred sixty-nine".