138188766 has 8 divisors (see below), whose sum is σ = 276377544. Its totient is φ = 46062920.

The previous prime is 138188759. The next prime is 138188777. The reversal of 138188766 is 667881831.

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

138188766 is an admirable number.

It is a super-2 number, since 2×138188766² = 38192270097205512, which contains 22 as substring.

It is a Curzon number.

It is a congruent 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, 11515725 + ... + 11515736.

It is an arithmetic number, because the mean of its divisors is an integer number (34547193).

Almost surely, 2^138188766 is an apocalyptic number.

138188766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138188766 is a wasteful number, since it uses less digits than its factorization.

138188766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23031466.

The product of its digits is 387072, while the sum is 48.

The square root of 138188766 is about 11755.3717933547. The cubic root of 138188766 is about 517.0004402223. Note that the first 3 decimals are identical.

It can be divided in two parts, 1381887 and 66, that added together give a triangular number (1381953 = T₁₆₆₂).

The spelling of 138188766 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, seven hundred sixty-six".