138233587 has 2 divisors, whose sum is σ = 138233588. Its totient is φ = 138233586.

The previous prime is 138233561. The next prime is 138233597. The reversal of 138233587 is 785332831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138233587 is a prime.

It is not a weakly prime, because it can be changed into another prime (138233507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69116793 + 69116794.

It is an arithmetic number, because the mean of its divisors is an integer number (69116794).

Almost surely, 2^138233587 is an apocalyptic number.

138233587 is a deficient number, since it is larger than the sum of its proper divisors (1).

138233587 is an equidigital number, since it uses as much as digits as its factorization.

138233587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 138233587 is about 11757.2780438331. The cubic root of 138233587 is about 517.0563298881.

It can be divided in two parts, 1382 and 33587, that added together give a square (34969 = 187²).

The spelling of 138233587 in words is "one hundred thirty-eight million, two hundred thirty-three thousand, five hundred eighty-seven".