198431922 has 64 divisors (see below), whose sum is σ = 455051520. Its totient is φ = 57145344.

The previous prime is 198431903. The next prime is 198431941. The reversal of 198431922 is 229134891.

It is an interprime number because it is at equal distance from previous prime (198431903) and next prime (198431941).

It is a super-2 number, since 2×198431922² = 78750455337228168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 348454 + ... + 349022.

It is an arithmetic number, because the mean of its divisors is an integer number (7110180).

Almost surely, 2^198431922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198431922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227525760).

198431922 is an abundant number, since it is smaller than the sum of its proper divisors (256619598).

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

198431922 is a wasteful number, since it uses less digits than its factorization.

198431922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867.

The product of its digits is 31104, while the sum is 39.

The square root of 198431922 is about 14086.5865986051. The cubic root of 198431922 is about 583.2711732041.

The spelling of 198431922 in words is "one hundred ninety-eight million, four hundred thirty-one thousand, nine hundred twenty-two".