188129538 has 12 divisors (see below), whose sum is σ = 407614038. Its totient is φ = 62709840.

The previous prime is 188129533. The next prime is 188129563. The reversal of 188129538 is 835921881.

It is a happy number.

188129538 is a `hidden beast` number, since 18 + 81 + 29 + 538 = 666.

It can be written as a sum of positive squares in only one way, i.e., 184769649 + 3359889 = 13593^2 + 1833^2 .

It is a junction number, because it is equal to n+sod(n) for n = 188129493 and 188129502.

It is not an unprimeable number, because it can be changed into a prime (188129533) 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 5 ways as a sum of consecutive naturals, for example, 5225803 + ... + 5225838.

Almost surely, 2^188129538 is an apocalyptic number.

188129538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

188129538 is an abundant number, since it is smaller than the sum of its proper divisors (219484500).

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

188129538 is a wasteful number, since it uses less digits than its factorization.

188129538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10451649 (or 10451646 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 188129538 is about 13716.0321521933. The cubic root of 188129538 is about 572.9969755786.

The spelling of 188129538 in words is "one hundred eighty-eight million, one hundred twenty-nine thousand, five hundred thirty-eight".