138684170 has 8 divisors (see below), whose sum is σ = 249631524. Its totient is φ = 55473664.

The previous prime is 138684151. The next prime is 138684193. The reversal of 138684170 is 71486831.

It can be written as a sum of positive squares in 2 ways, for example, as 125731369 + 12952801 = 11213^2 + 3599^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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, 6934199 + ... + 6934218.

Almost surely, 2^138684170 is an apocalyptic number.

138684170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138684170 is a deficient number, since it is larger than the sum of its proper divisors (110947354).

138684170 is a wasteful number, since it uses less digits than its factorization.

138684170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13868424.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 138684170 is about 11776.4243299908. The cubic root of 138684170 is about 517.6175155341.

The spelling of 138684170 in words is "one hundred thirty-eight million, six hundred eighty-four thousand, one hundred seventy".