138063891 has 8 divisors (see below), whose sum is σ = 210383104. Its totient is φ = 78893640.

The previous prime is 138063881. The next prime is 138063911. The reversal of 138063891 is 198360831.

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

It is not a de Polignac number, because 138063891 - 2⁷ = 138063763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138063811) 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, 3287215 + ... + 3287256.

It is an arithmetic number, because the mean of its divisors is an integer number (26297888).

Almost surely, 2^138063891 is an apocalyptic number.

138063891 is a deficient number, since it is larger than the sum of its proper divisors (72319213).

138063891 is an equidigital number, since it uses as much as digits as its factorization.

138063891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6574481.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 138063891 is about 11750.0591913403. The cubic root of 138063891 is about 516.8446632408.

The spelling of 138063891 in words is "one hundred thirty-eight million, sixty-three thousand, eight hundred ninety-one".