1243320198 has 16 divisors (see below), whose sum is σ = 2512277040. Its totient is φ = 410167296.

The previous prime is 1243320191. The next prime is 1243320229. The reversal of 1243320198 is 8910233421.

It is a super-2 number, since 2×1243320198² = 3091690229509518408, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243320191) 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, 1067563 + ... + 1068726.

It is an arithmetic number, because the mean of its divisors is an integer number (157017315).

Almost surely, 2^1243320198 is an apocalyptic number.

1243320198 is an abundant number, since it is smaller than the sum of its proper divisors (1268956842).

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

1243320198 is a wasteful number, since it uses less digits than its factorization.

1243320198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136391.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1243320198 is about 35260.7458514422. The cubic root of 1243320198 is about 1075.2950905776.

The spelling of 1243320198 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, one hundred ninety-eight".