102138830 has 16 divisors (see below), whose sum is σ = 183974544. Its totient is φ = 40827840.

The previous prime is 102138821. The next prime is 102138857. The reversal of 102138830 is 38831201.

It is a self number, because there is not a number n which added to its sum of digits gives 102138830.

It is a congruent number.

It is an unprimeable number.

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, 18914 + ... + 23706.

It is an arithmetic number, because the mean of its divisors is an integer number (11498409).

Almost surely, 2^102138830 is an apocalyptic number.

102138830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102138830 is a deficient number, since it is larger than the sum of its proper divisors (81835714).

102138830 is a wasteful number, since it uses less digits than its factorization.

102138830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6931.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 102138830 is about 10106.3757104117. The cubic root of 102138830 is about 467.4447569295. Note that the first 3 decimals are identical.

The spelling of 102138830 in words is "one hundred two million, one hundred thirty-eight thousand, eight hundred thirty".