198904123850 has 12 divisors (see below), whose sum is σ = 369961670454. Its totient is φ = 79561649520.

The previous prime is 198904123823. The next prime is 198904123853. The reversal of 198904123850 is 58321409891.

198904123850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 161860577761 + 37043546089 = 402319^2 + 192467^2 .

It is a super-2 number, since 2×198904123850² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 3978082477 = 198904123850 / (1 + 9 + 8 + 9 + 0 + 4 + 1 + 2 + 3 + 8 + 5 + 0).

It is not an unprimeable number, because it can be changed into a prime (198904123853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1989041189 + ... + 1989041288.

Almost surely, 2^198904123850 is an apocalyptic number.

198904123850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198904123850 is a deficient number, since it is larger than the sum of its proper divisors (171057546604).

198904123850 is a wasteful number, since it uses less digits than its factorization.

198904123850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978082489 (or 3978082484 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 198904123850 in words is "one hundred ninety-eight billion, nine hundred four million, one hundred twenty-three thousand, eight hundred fifty".