102209978 has 32 divisors (see below), whose sum is σ = 171763200. Its totient is φ = 45291456.

The previous prime is 102209941. The next prime is 102210019. The reversal of 102209978 is 879902201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213143 + ... + 213621.

It is an arithmetic number, because the mean of its divisors is an integer number (5367600).

Almost surely, 2^102209978 is an apocalyptic number.

102209978 is a deficient number, since it is larger than the sum of its proper divisors (69553222).

102209978 is a wasteful number, since it uses less digits than its factorization.

102209978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 102209978 is about 10109.8950538569. The cubic root of 102209978 is about 467.5532694978.

The spelling of 102209978 in words is "one hundred two million, two hundred nine thousand, nine hundred seventy-eight".