138725469 has 12 divisors (see below), whose sum is σ = 205797436. Its totient is φ = 89983872.

The previous prime is 138725437. The next prime is 138725497. The reversal of 138725469 is 964527831.

138725469 is a `hidden beast` number, since 1 + 38 + 72 + 546 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 64593369 + 74132100 = 8037^2 + 8610^2 .

It is not a de Polignac number, because 138725469 - 2⁵ = 138725437 is a prime.

It is a super-2 number, since 2×138725469² = 38489511498539922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138725429) 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 in 11 ways as a sum of consecutive naturals, for example, 207964 + ... + 208629.

Almost surely, 2^138725469 is an apocalyptic number.

It is an amenable number.

138725469 is a deficient number, since it is larger than the sum of its proper divisors (67071967).

138725469 is a wasteful number, since it uses less digits than its factorization.

138725469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416636 (or 416633 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 138725469 is about 11778.1776604023. The cubic root of 138725469 is about 517.6688911745.

The spelling of 138725469 in words is "one hundred thirty-eight million, seven hundred twenty-five thousand, four hundred sixty-nine".