121992198 has 64 divisors (see below), whose sum is σ = 264695040. Its totient is φ = 37366272.

The previous prime is 121992197. The next prime is 121992203. The reversal of 121992198 is 891299121.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121992197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 890386 + ... + 890522.

It is an arithmetic number, because the mean of its divisors is an integer number (4135860).

Almost surely, 2^121992198 is an apocalyptic number.

121992198 is an abundant number, since it is smaller than the sum of its proper divisors (142702842).

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

121992198 is a wasteful number, since it uses less digits than its factorization.

121992198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341.

The product of its digits is 23328, while the sum is 42.

The square root of 121992198 is about 11045.0078315952. The cubic root of 121992198 is about 495.9569936480.

The spelling of 121992198 in words is "one hundred twenty-one million, nine hundred ninety-two thousand, one hundred ninety-eight".