102129978 has 32 divisors (see below), whose sum is σ = 215611200. Its totient is φ = 32161536.

The previous prime is 102129977. The next prime is 102129983. The reversal of 102129978 is 879921201.

It is not an unprimeable number, because it can be changed into a prime (102129977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48328 + ... + 50396.

It is an arithmetic number, because the mean of its divisors is an integer number (6737850).

Almost surely, 2^102129978 is an apocalyptic number.

102129978 is an abundant number, since it is smaller than the sum of its proper divisors (113481222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102129978 is a wasteful number, since it uses less digits than its factorization.

102129978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 102129978 is about 10105.9377595550. The cubic root of 102129978 is about 467.4312526284.

The spelling of 102129978 in words is "one hundred two million, one hundred twenty-nine thousand, nine hundred seventy-eight".