138667285 has 8 divisors (see below), whose sum is σ = 167363640. Its totient is φ = 110291904.

The previous prime is 138667279. The next prime is 138667307. The reversal of 138667285 is 582766831.

It can be written as a sum of positive squares in 4 ways, for example, as 39425841 + 99241444 = 6279^2 + 9962^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138667285 - 2¹⁹ = 138142997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79290 + ... + 81019.

It is an arithmetic number, because the mean of its divisors is an integer number (20920455).

Almost surely, 2^138667285 is an apocalyptic number.

It is an amenable number.

138667285 is a deficient number, since it is larger than the sum of its proper divisors (28696355).

138667285 is a wasteful number, since it uses less digits than its factorization.

138667285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160487.

The product of its digits is 483840, while the sum is 46.

The square root of 138667285 is about 11775.7074097483. The cubic root of 138667285 is about 517.5965077856.

The spelling of 138667285 in words is "one hundred thirty-eight million, six hundred sixty-seven thousand, two hundred eighty-five".