138677405 has 4 divisors (see below), whose sum is σ = 166412892. Its totient is φ = 110941920.

The previous prime is 138677389. The next prime is 138677411. The reversal of 138677405 is 504776831.

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 104816644 + 33860761 = 10238^2 + 5819^2 .

It is not a de Polignac number, because 138677405 - 2⁴ = 138677389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13867736 + ... + 13867745.

It is an arithmetic number, because the mean of its divisors is an integer number (41603223).

Almost surely, 2^138677405 is an apocalyptic number.

It is an amenable number.

138677405 is a deficient number, since it is larger than the sum of its proper divisors (27735487).

138677405 is an equidigital number, since it uses as much as digits as its factorization.

138677405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27735486.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 138677405 is about 11776.1371000851. The cubic root of 138677405 is about 517.6090989536.

The spelling of 138677405 in words is "one hundred thirty-eight million, six hundred seventy-seven thousand, four hundred five".