198909425 has 24 divisors (see below), whose sum is σ = 289773120. Its totient is φ = 133531200.

The previous prime is 198909383. The next prime is 198909427. The reversal of 198909425 is 524909891.

It is not a de Polignac number, because 198909425 - 2⁸ = 198909169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198909425.

It is not an unprimeable number, because it can be changed into a prime (198909427) 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, 24245 + ... + 31394.

It is an arithmetic number, because the mean of its divisors is an integer number (12073880).

Almost surely, 2^198909425 is an apocalyptic number.

It is an amenable number.

198909425 is a deficient number, since it is larger than the sum of its proper divisors (90863695).

198909425 is a wasteful number, since it uses less digits than its factorization.

198909425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55673 (or 55668 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 198909425 is about 14103.5252685277. The cubic root of 198909425 is about 583.7386561691.

The spelling of 198909425 in words is "one hundred ninety-eight million, nine hundred nine thousand, four hundred twenty-five".