138780677 has 4 divisors (see below), whose sum is σ = 158606496. Its totient is φ = 118954860.

The previous prime is 138780671. The next prime is 138780701. The reversal of 138780677 is 776087831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138780677 - 2²⁴ = 122003461 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 (138780671) 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, 9912899 + ... + 9912912.

It is an arithmetic number, because the mean of its divisors is an integer number (39651624).

Almost surely, 2^138780677 is an apocalyptic number.

It is an amenable number.

138780677 is a deficient number, since it is larger than the sum of its proper divisors (19825819).

138780677 is an equidigital number, since it uses as much as digits as its factorization.

138780677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19825818.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 138780677 is about 11780.5210835514. The cubic root of 138780677 is about 517.7375535813.

The spelling of 138780677 in words is "one hundred thirty-eight million, seven hundred eighty thousand, six hundred seventy-seven".