138077886 has 32 divisors (see below), whose sum is σ = 280051200. Its totient is φ = 45381024.

The previous prime is 138077881. The next prime is 138077899. The reversal of 138077886 is 688770831.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138077881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230215 + ... + 230813.

It is an arithmetic number, because the mean of its divisors is an integer number (8751600).

Almost surely, 2^138077886 is an apocalyptic number.

138077886 is an abundant number, since it is smaller than the sum of its proper divisors (141973314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138077886 is a wasteful number, since it uses less digits than its factorization.

138077886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 138077886 is about 11750.6547051643. The cubic root of 138077886 is about 516.8621261623.

The spelling of 138077886 in words is "one hundred thirty-eight million, seventy-seven thousand, eight hundred eighty-six".