102129942 has 16 divisors (see below), whose sum is σ = 206366832. Its totient is φ = 33692160.

The previous prime is 102129899. The next prime is 102129943. The reversal of 102129942 is 249921201.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102129943) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 87159 + ... + 88322.

It is an arithmetic number, because the mean of its divisors is an integer number (12897927).

Almost surely, 2^102129942 is an apocalyptic number.

102129942 is an abundant number, since it is smaller than the sum of its proper divisors (104236890).

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

102129942 is a wasteful number, since it uses less digits than its factorization.

102129942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175583.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 102129942 is about 10105.9359784238. The cubic root of 102129942 is about 467.4311977065.

The spelling of 102129942 in words is "one hundred two million, one hundred twenty-nine thousand, nine hundred forty-two".