1242199998 has 24 divisors (see below), whose sum is σ = 2898467208. Its totient is φ = 382215312.

The previous prime is 1242199957. The next prime is 1242199999. The reversal of 1242199998 is 8999912421.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242199999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2654040 + ... + 2654507.

It is an arithmetic number, because the mean of its divisors is an integer number (120769467).

Almost surely, 2^1242199998 is an apocalyptic number.

1242199998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1242199998 is an abundant number, since it is smaller than the sum of its proper divisors (1656267210).

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

1242199998 is a wasteful number, since it uses less digits than its factorization.

1242199998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308568 (or 5308565 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 1242199998 is about 35244.8577525857. The cubic root of 1242199998 is about 1074.9720556644.

The spelling of 1242199998 in words is "one billion, two hundred forty-two million, one hundred ninety-nine thousand, nine hundred ninety-eight".