138469 has 2 divisors, whose sum is σ = 138470. Its totient is φ = 138468.

The previous prime is 138461. The next prime is 138493. The reversal of 138469 is 964831.

138469 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., 112225 + 26244 = 335^2 + 162^2 .

It is a cyclic number.

It is not a de Polignac number, because 138469 - 2³ = 138461 is a prime.

It is a super-2 number, since 2×138469² = 38347327922, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 138469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69234 + 69235.

It is an arithmetic number, because the mean of its divisors is an integer number (69235).

2¹³⁸⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

138469 is a deficient number, since it is larger than the sum of its proper divisors (1).

138469 is an equidigital number, since it uses as much as digits as its factorization.

138469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 138469 is about 372.1142297736. The cubic root of 138469 is about 51.7349680566.

The spelling of 138469 in words is "one hundred thirty-eight thousand, four hundred sixty-nine".