138170865 has 32 divisors (see below), whose sum is σ = 254499840. Its totient is φ = 62702784.

The previous prime is 138170827. The next prime is 138170887. The reversal of 138170865 is 568071831.

It is not a de Polignac number, because 138170865 - 2⁶ = 138170801 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9862 + ... + 19328.

It is an arithmetic number, because the mean of its divisors is an integer number (7953120).

Almost surely, 2^138170865 is an apocalyptic number.

138170865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138170865 is a deficient number, since it is larger than the sum of its proper divisors (116328975).

138170865 is a wasteful number, since it uses less digits than its factorization.

138170865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9621.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 138170865 is about 11754.6103721051. The cubic root of 138170865 is about 516.9781151452.

The spelling of 138170865 in words is "one hundred thirty-eight million, one hundred seventy thousand, eight hundred sixty-five".