138126287 has 8 divisors (see below), whose sum is σ = 150225600. Its totient is φ = 126237600.

The previous prime is 138126281. The next prime is 138126323. The reversal of 138126287 is 782621831.

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 138126287 - 2⁴ = 138126271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138126287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138126281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51287 + ... + 53912.

It is an arithmetic number, because the mean of its divisors is an integer number (18778200).

Almost surely, 2^138126287 is an apocalyptic number.

138126287 is a deficient number, since it is larger than the sum of its proper divisors (12099313).

138126287 is a wasteful number, since it uses less digits than its factorization.

138126287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105313.

The product of its digits is 32256, while the sum is 38.

The square root of 138126287 is about 11752.7140269812. The cubic root of 138126287 is about 516.9225116978.

The spelling of 138126287 in words is "one hundred thirty-eight million, one hundred twenty-six thousand, two hundred eighty-seven".