198634381 has 8 divisors (see below), whose sum is σ = 221977728. Its totient is φ = 176172000.

The previous prime is 198634349. The next prime is 198634393. The reversal of 198634381 is 183436891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198634381 - 2⁵ = 198634349 is a prime.

It is a super-2 number, since 2×198634381² = 78911234630506322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198634321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219765 + ... + 220666.

It is an arithmetic number, because the mean of its divisors is an integer number (27747216).

Almost surely, 2^198634381 is an apocalyptic number.

198634381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198634381 is a deficient number, since it is larger than the sum of its proper divisors (23343347).

198634381 is a wasteful number, since it uses less digits than its factorization.

198634381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440483.

The product of its digits is 124416, while the sum is 43.

The square root of 198634381 is about 14093.7709999844. The cubic root of 198634381 is about 583.4694752352.

The spelling of 198634381 in words is "one hundred ninety-eight million, six hundred thirty-four thousand, three hundred eighty-one".