138077817 has 8 divisors (see below), whose sum is σ = 184868640. Its totient is φ = 91669440.

The previous prime is 138077803. The next prime is 138077843. The reversal of 138077817 is 718770831.

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

It is not a de Polignac number, because 138077817 - 2⁴ = 138077801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138077857) 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, 94767 + ... + 96212.

It is an arithmetic number, because the mean of its divisors is an integer number (23108580).

Almost surely, 2^138077817 is an apocalyptic number.

It is an amenable number.

138077817 is a deficient number, since it is larger than the sum of its proper divisors (46790823).

138077817 is a wasteful number, since it uses less digits than its factorization.

138077817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191223.

The product of its (nonzero) digits is 65856, while the sum is 42.

The square root of 138077817 is about 11750.6517691573. The cubic root of 138077817 is about 516.8620400672.

It can be divided in two parts, 1380 and 77817, that added together give a palindrome (79197).

The spelling of 138077817 in words is "one hundred thirty-eight million, seventy-seven thousand, eight hundred seventeen".