198905425 has 24 divisors (see below), whose sum is σ = 250843320. Its totient is φ = 156441600.

The previous prime is 198905419. The next prime is 198905429. The reversal of 198905425 is 524509891.

It can be written as a sum of positive squares in 12 ways, for example, as 188485441 + 10419984 = 13729^2 + 3228^2 .

It is not a de Polignac number, because 198905425 - 2³ = 198905417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198905429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 511131 + ... + 511519.

It is an arithmetic number, because the mean of its divisors is an integer number (10451805).

Almost surely, 2^198905425 is an apocalyptic number.

It is an amenable number.

198905425 is a deficient number, since it is larger than the sum of its proper divisors (51937895).

198905425 is a wasteful number, since it uses less digits than its factorization.

198905425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 198905425 is about 14103.3834592980. The cubic root of 198905425 is about 583.7347432151.

The spelling of 198905425 in words is "one hundred ninety-eight million, nine hundred five thousand, four hundred twenty-five".