138774877 has 4 divisors (see below), whose sum is σ = 139479516. Its totient is φ = 138070240.

The previous prime is 138774871. The next prime is 138774943. The reversal of 138774877 is 778477831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 778477831 = 367 ⋅2121193.

It can be written as a sum of positive squares in 2 ways, for example, as 127712601 + 11062276 = 11301^2 + 3326^2 .

It is a cyclic number.

It is not a de Polignac number, because 138774877 - 2³ = 138774869 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 (138774871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352024 + ... + 352417.

It is an arithmetic number, because the mean of its divisors is an integer number (34869879).

Almost surely, 2^138774877 is an apocalyptic number.

It is an amenable number.

138774877 is a deficient number, since it is larger than the sum of its proper divisors (704639).

138774877 is an equidigital number, since it uses as much as digits as its factorization.

138774877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704638.

The product of its digits is 1843968, while the sum is 52.

The square root of 138774877 is about 11780.2749119025. The cubic root of 138774877 is about 517.7303409546.

The spelling of 138774877 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, eight hundred seventy-seven".