138822861 has 8 divisors (see below), whose sum is σ = 187860064. Its totient is φ = 91167120.

The previous prime is 138822857. The next prime is 138822883. The reversal of 138822861 is 168228831.

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

It is not a de Polignac number, because 138822861 - 2² = 138822857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138822461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345130 + ... + 345531.

It is an arithmetic number, because the mean of its divisors is an integer number (23482508).

Almost surely, 2^138822861 is an apocalyptic number.

It is an amenable number.

138822861 is a deficient number, since it is larger than the sum of its proper divisors (49037203).

138822861 is an equidigital number, since it uses as much as digits as its factorization.

138822861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690731.

The product of its digits is 36864, while the sum is 39.

The square root of 138822861 is about 11782.3113606796. The cubic root of 138822861 is about 517.7900057165.

The spelling of 138822861 in words is "one hundred thirty-eight million, eight hundred twenty-two thousand, eight hundred sixty-one".