102106638 has 12 divisors (see below), whose sum is σ = 221231088. Its totient is φ = 34035540.

The previous prime is 102106621. The next prime is 102106649. The reversal of 102106638 is 836601201.

102106638 is a `hidden beast` number, since 1 + 0 + 21 + 0 + 6 + 638 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2836278 + ... + 2836313.

It is an arithmetic number, because the mean of its divisors is an integer number (18435924).

Almost surely, 2^102106638 is an apocalyptic number.

102106638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

102106638 is an abundant number, since it is smaller than the sum of its proper divisors (119124450).

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

102106638 is a wasteful number, since it uses less digits than its factorization.

102106638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672599 (or 5672596 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 102106638 is about 10104.7829269114. The cubic root of 102106638 is about 467.3956422006.

Adding to 102106638 its reverse (836601201), we get a palindrome (938707839).

The spelling of 102106638 in words is "one hundred two million, one hundred six thousand, six hundred thirty-eight".