138654787 has 4 divisors (see below), whose sum is σ = 144683280. Its totient is φ = 132626296.

The previous prime is 138654767. The next prime is 138654793. The reversal of 138654787 is 787456831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138654787 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 138654787.

It is not an unprimeable number, because it can be changed into a prime (138654727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3014212 + ... + 3014257.

It is an arithmetic number, because the mean of its divisors is an integer number (36170820).

Almost surely, 2^138654787 is an apocalyptic number.

138654787 is a deficient number, since it is larger than the sum of its proper divisors (6028493).

138654787 is an equidigital number, since it uses as much as digits as its factorization.

138654787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6028492.

The product of its digits is 1128960, while the sum is 49.

The square root of 138654787 is about 11775.1767290347. The cubic root of 138654787 is about 517.5809570965.

The spelling of 138654787 in words is "one hundred thirty-eight million, six hundred fifty-four thousand, seven hundred eighty-seven".