101778939 has 24 divisors (see below), whose sum is σ = 149722560. Its totient is φ = 66613248.

The previous prime is 101778889. The next prime is 101778947. The reversal of 101778939 is 939877101.

It is not a de Polignac number, because 101778939 - 2¹¹ = 101776891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101778894 and 101778903.

It is not an unprimeable number, because it can be changed into a prime (101778959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182449 + ... + 183005.

It is an arithmetic number, because the mean of its divisors is an integer number (6238440).

Almost surely, 2^101778939 is an apocalyptic number.

101778939 is a deficient number, since it is larger than the sum of its proper divisors (47943621).

101778939 is a wasteful number, since it uses less digits than its factorization.

101778939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 896 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 101778939 is about 10088.5548519102. The cubic root of 101778939 is about 466.8950895911.

The spelling of 101778939 in words is "one hundred one million, seven hundred seventy-eight thousand, nine hundred thirty-nine".