138657827 has 16 divisors (see below), whose sum is σ = 173760000. Its totient is φ = 107490240.

The previous prime is 138657811. The next prime is 138657853. The reversal of 138657827 is 728756831.

It is a happy number.

It is not a de Polignac number, because 138657827 - 2⁴ = 138657811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138657887) 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, 10799 + ... + 19847.

It is an arithmetic number, because the mean of its divisors is an integer number (10860000).

Almost surely, 2^138657827 is an apocalyptic number.

138657827 is a deficient number, since it is larger than the sum of its proper divisors (35102173).

138657827 is a wasteful number, since it uses less digits than its factorization.

138657827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9266.

The product of its digits is 564480, while the sum is 47.

The square root of 138657827 is about 11775.3058134386. The cubic root of 138657827 is about 517.5847397153.

The spelling of 138657827 in words is "one hundred thirty-eight million, six hundred fifty-seven thousand, eight hundred twenty-seven".