138777087 has 16 divisors (see below), whose sum is σ = 189917280. Its totient is φ = 90086400.

The previous prime is 138777061. The next prime is 138777109. The reversal of 138777087 is 780777831.

It is not a de Polignac number, because 138777087 - 2¹⁰ = 138776063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138777017) 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, 101287 + ... + 102647.

It is an arithmetic number, because the mean of its divisors is an integer number (11869830).

Almost surely, 2^138777087 is an apocalyptic number.

138777087 is a deficient number, since it is larger than the sum of its proper divisors (51140193).

138777087 is a wasteful number, since it uses less digits than its factorization.

138777087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234.

The product of its (nonzero) digits is 460992, while the sum is 48.

The square root of 138777087 is about 11780.3687123961. The cubic root of 138777087 is about 517.7330892378.

The spelling of 138777087 in words is "one hundred thirty-eight million, seven hundred seventy-seven thousand, eighty-seven".