138780777 has 8 divisors (see below), whose sum is σ = 189554400. Its totient is φ = 90263840.

The previous prime is 138780749. The next prime is 138780779. The reversal of 138780777 is 777087831.

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 138780777 - 2¹¹ = 138778729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138780779) 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, 564027 + ... + 564272.

It is an arithmetic number, because the mean of its divisors is an integer number (23694300).

Almost surely, 2^138780777 is an apocalyptic number.

It is an amenable number.

138780777 is a deficient number, since it is larger than the sum of its proper divisors (50773623).

138780777 is a wasteful number, since it uses less digits than its factorization.

138780777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128343.

The product of its (nonzero) digits is 460992, while the sum is 48.

The square root of 138780777 is about 11780.5253278451. The cubic root of 138780777 is about 517.7376779352.

The spelling of 138780777 in words is "one hundred thirty-eight million, seven hundred eighty thousand, seven hundred seventy-seven".