198670919 has 4 divisors (see below), whose sum is σ = 199700496. Its totient is φ = 197641344.

The previous prime is 198670903. The next prime is 198670931. The reversal of 198670919 is 919076891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198670919 - 2⁴ = 198670903 is a prime.

It is a super-2 number, since 2×198670919² = 78940268112609122, 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 (198670949) 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, 514499 + ... + 514884.

It is an arithmetic number, because the mean of its divisors is an integer number (49925124).

Almost surely, 2^198670919 is an apocalyptic number.

198670919 is a deficient number, since it is larger than the sum of its proper divisors (1029577).

198670919 is a wasteful number, since it uses less digits than its factorization.

198670919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029576.

The product of its (nonzero) digits is 244944, while the sum is 50.

The square root of 198670919 is about 14095.0671867856. The cubic root of 198670919 is about 583.5052486674.

It can be divided in two parts, 19 and 8670919, that multiplied together give a palindrome (164747461).

The spelling of 198670919 in words is "one hundred ninety-eight million, six hundred seventy thousand, nine hundred nineteen".