138280587 has 8 divisors (see below), whose sum is σ = 185782080. Its totient is φ = 91483080.

The previous prime is 138280579. The next prime is 138280589. The reversal of 138280587 is 785082831.

It is a happy number.

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

It is not a de Polignac number, because 138280587 - 2³ = 138280579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138280589) 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, 175537 + ... + 176322.

It is an arithmetic number, because the mean of its divisors is an integer number (23222760).

Almost surely, 2^138280587 is an apocalyptic number.

138280587 is a deficient number, since it is larger than the sum of its proper divisors (47501493).

138280587 is a wasteful number, since it uses less digits than its factorization.

138280587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351993.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 138280587 is about 11759.2766359160. The cubic root of 138280587 is about 517.1149236890.

The spelling of 138280587 in words is "one hundred thirty-eight million, two hundred eighty thousand, five hundred eighty-seven".