198139933 has 4 divisors (see below), whose sum is σ = 199247040. Its totient is φ = 197032828.

The previous prime is 198139927. The next prime is 198139969. The reversal of 198139933 is 339931891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 339931891 = 13 ⋅26148607.

It is a cyclic number.

It is not a de Polignac number, because 198139933 - 2⁹ = 198139421 is a prime.

It is a super-3 number, since 3×198139933³ (a number of 26 digits) contains 333 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 (198139973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553285 + ... + 553642.

It is an arithmetic number, because the mean of its divisors is an integer number (49811760).

Almost surely, 2^198139933 is an apocalyptic number.

It is an amenable number.

198139933 is a deficient number, since it is larger than the sum of its proper divisors (1107107).

198139933 is a wasteful number, since it uses less digits than its factorization.

198139933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107106.

The product of its digits is 157464, while the sum is 46.

The square root of 198139933 is about 14076.2187038991. The cubic root of 198139933 is about 582.9849417539.

It can be divided in two parts, 1981 and 39933, that added together give a palindrome (41914).

The spelling of 198139933 in words is "one hundred ninety-eight million, one hundred thirty-nine thousand, nine hundred thirty-three".