189129793850 has 36 divisors (see below), whose sum is σ = 361324758222. Its totient is φ = 73599991200.

The previous prime is 189129793819. The next prime is 189129793859. The reversal of 189129793850 is 58397921981.

It can be written as a sum of positive squares in 3 ways, for example, as 171852531601 + 17277262249 = 414551^2 + 131443^2 .

It is not an unprimeable number, because it can be changed into a prime (189129793859) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18700295 + ... + 18710405.

Almost surely, 2^189129793850 is an apocalyptic number.

189129793850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189129793850 is a deficient number, since it is larger than the sum of its proper divisors (172194964372).

189129793850 is an frugal number, since it uses more digits than its factorization.

189129793850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20271 (or 10155 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 62.

The spelling of 189129793850 in words is "one hundred eighty-nine billion, one hundred twenty-nine million, seven hundred ninety-three thousand, eight hundred fifty".