198137490 has 16 divisors (see below), whose sum is σ = 475530048. Its totient is φ = 52836656.

The previous prime is 198137473. The next prime is 198137497. The reversal of 198137490 is 94731891.

It is a happy number.

It is a super-3 number, since 3×198137490³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (198137497) 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, 3302262 + ... + 3302321.

It is an arithmetic number, because the mean of its divisors is an integer number (29720628).

Almost surely, 2^198137490 is an apocalyptic number.

198137490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198137490 is an abundant number, since it is smaller than the sum of its proper divisors (277392558).

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

198137490 is a wasteful number, since it uses less digits than its factorization.

198137490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604593.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 198137490 is about 14076.1319260655. The cubic root of 198137490 is about 582.9825457401.

The spelling of 198137490 in words is "one hundred ninety-eight million, one hundred thirty-seven thousand, four hundred ninety".