198155925 has 108 divisors (see below), whose sum is σ = 410982624. Its totient is φ = 90340800.

The previous prime is 198155899. The next prime is 198155933. The reversal of 198155925 is 529551891.

198155925 is a `hidden beast` number, since 1 + 98 + 1 + 559 + 2 + 5 = 666.

It is not a de Polignac number, because 198155925 - 2⁸ = 198155669 is a prime.

It is a super-2 number, since 2×198155925² = 78531541225211250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 3358546 + ... + 3358604.

Almost surely, 2^198155925 is an apocalyptic number.

198155925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198155925 is an abundant number, since it is smaller than the sum of its proper divisors (212826699).

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

198155925 is a wasteful number, since it uses less digits than its factorization.

198155925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 101 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The square root of 198155925 is about 14076.7867427194. The cubic root of 198155925 is about 583.0006256938. Note that the first 3 decimals are identical.

The spelling of 198155925 in words is "one hundred ninety-eight million, one hundred fifty-five thousand, nine hundred twenty-five".