101806138 has 8 divisors (see below), whose sum is σ = 174524832. Its totient is φ = 43631196.

The previous prime is 101806091. The next prime is 101806169. The reversal of 101806138 is 831608101.

It is a happy number.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3635920 + ... + 3635947.

It is an arithmetic number, because the mean of its divisors is an integer number (21815604).

Almost surely, 2^101806138 is an apocalyptic number.

101806138 is a deficient number, since it is larger than the sum of its proper divisors (72718694).

101806138 is an equidigital number, since it uses as much as digits as its factorization.

101806138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7271876.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 101806138 is about 10089.9027745564. The cubic root of 101806138 is about 466.9366762841.

The spelling of 101806138 in words is "one hundred one million, eight hundred six thousand, one hundred thirty-eight".