138287999 has 8 divisors (see below), whose sum is σ = 140348160. Its totient is φ = 136235736.

The previous prime is 138287987. The next prime is 138288019. The reversal of 138287999 is 999782831.

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 138287999 - 2¹² = 138283903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138287599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39644 + ... + 42990.

It is an arithmetic number, because the mean of its divisors is an integer number (17543520).

Almost surely, 2^138287999 is an apocalyptic number.

138287999 is a deficient number, since it is larger than the sum of its proper divisors (2060161).

138287999 is an equidigital number, since it uses as much as digits as its factorization.

138287999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949.

The product of its digits is 1959552, while the sum is 56.

The square root of 138287999 is about 11759.5917871327. The cubic root of 138287999 is about 517.1241628440.

The spelling of 138287999 in words is "one hundred thirty-eight million, two hundred eighty-seven thousand, nine hundred ninety-nine".