102129538 has 16 divisors (see below), whose sum is σ = 175310784. Its totient is φ = 43711920.

The previous prime is 102129529. The next prime is 102129539. The reversal of 102129538 is 835921201.

It is a super-5 number, since 5×102129538⁵ (a number of 41 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (102129539) 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, 7168 + ... + 15988.

It is an arithmetic number, because the mean of its divisors is an integer number (10956924).

Almost surely, 2^102129538 is an apocalyptic number.

102129538 is a deficient number, since it is larger than the sum of its proper divisors (73181246).

102129538 is an equidigital number, since it uses as much as digits as its factorization.

102129538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 102129538 is about 10105.9159901515. The cubic root of 102129538 is about 467.4305813595.

The spelling of 102129538 in words is "one hundred two million, one hundred twenty-nine thousand, five hundred thirty-eight".