105145978 has 16 divisors (see below), whose sum is σ = 181906560. Its totient is φ = 44648496.

The previous prime is 105145951. The next prime is 105145979. The reversal of 105145978 is 879541501.

It is a happy number.

It is a super-2 number, since 2×105145978² = 22111353379152968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105145978.

It is not an unprimeable number, because it can be changed into a prime (105145979) 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 7 ways as a sum of consecutive naturals, for example, 32926 + ... + 35977.

It is an arithmetic number, because the mean of its divisors is an integer number (11369160).

Almost surely, 2^105145978 is an apocalyptic number.

105145978 is a deficient number, since it is larger than the sum of its proper divisors (76760582).

105145978 is a wasteful number, since it uses less digits than its factorization.

105145978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69021.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 105145978 is about 10254.0712890052. The cubic root of 105145978 is about 471.9879252154.

The spelling of 105145978 in words is "one hundred five million, one hundred forty-five thousand, nine hundred seventy-eight".