138435489 has 12 divisors (see below), whose sum is σ = 200304000. Its totient is φ = 92132664.

The previous prime is 138435487. The next prime is 138435499. The reversal of 138435489 is 984534831.

138435489 is a `hidden beast` number, since 138 + 4 + 35 + 489 = 666.

It is not a de Polignac number, because 138435489 - 2¹ = 138435487 is a prime.

It is a super-2 number, since 2×138435489² = 38328769229338242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138435487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7449 + ... + 18230.

It is an arithmetic number, because the mean of its divisors is an integer number (16692000).

Almost surely, 2^138435489 is an apocalyptic number.

It is an amenable number.

138435489 is a deficient number, since it is larger than the sum of its proper divisors (61868511).

138435489 is a wasteful number, since it uses less digits than its factorization.

138435489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26284 (or 26281 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 138435489 is about 11765.8611669525. The cubic root of 138435489 is about 517.3079424539.

The spelling of 138435489 in words is "one hundred thirty-eight million, four hundred thirty-five thousand, four hundred eighty-nine".