138877289 has 8 divisors (see below), whose sum is σ = 152543040. Its totient is φ = 125847216.

The previous prime is 138877261. The next prime is 138877309. The reversal of 138877289 is 982778831.

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 138877289 - 2²⁴ = 122100073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138877289.

It is not an unprimeable number, because it can be changed into a prime (138877789) 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, 158462 + ... + 159335.

It is an arithmetic number, because the mean of its divisors is an integer number (19067880).

Almost surely, 2^138877289 is an apocalyptic number.

138877289 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138877289 is a deficient number, since it is larger than the sum of its proper divisors (13665751).

138877289 is a wasteful number, since it uses less digits than its factorization.

138877289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317839.

The product of its digits is 1354752, while the sum is 53.

The square root of 138877289 is about 11784.6208678939. The cubic root of 138877289 is about 517.8576665035.

Adding to 138877289 its product of digits (1354752), we get a palindrome (140232041).

The spelling of 138877289 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, two hundred eighty-nine".