138767477 has 4 divisors (see below), whose sum is σ = 139160940. Its totient is φ = 138374016.

The previous prime is 138767467. The next prime is 138767509. The reversal of 138767477 is 774767831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 89851441 + 48916036 = 9479^2 + 6994^2 .

It is a cyclic number.

It is not a de Polignac number, because 138767477 - 2²⁰ = 137718901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138767417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196202 + ... + 196907.

It is an arithmetic number, because the mean of its divisors is an integer number (34790235).

Almost surely, 2^138767477 is an apocalyptic number.

It is an amenable number.

138767477 is a deficient number, since it is larger than the sum of its proper divisors (393463).

138767477 is an equidigital number, since it uses as much as digits as its factorization.

138767477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393462.

The product of its digits is 1382976, while the sum is 50.

The square root of 138767477 is about 11779.9608233644. The cubic root of 138767477 is about 517.7211383461.

The spelling of 138767477 in words is "one hundred thirty-eight million, seven hundred sixty-seven thousand, four hundred seventy-seven".