1220209998 has 16 divisors (see below), whose sum is σ = 2789051520. Its totient is φ = 348631416.

The previous prime is 1220209993. The next prime is 1220209999. The reversal of 1220209998 is 8999020221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 29052619 = 1220209998 / (1 + 2 + 2 + 0 + 2 + 0 + 9 + 9 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220209993) 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 7 ways as a sum of consecutive naturals, for example, 14526268 + ... + 14526351.

It is an arithmetic number, because the mean of its divisors is an integer number (174315720).

Almost surely, 2^1220209998 is an apocalyptic number.

1220209998 is an abundant number, since it is smaller than the sum of its proper divisors (1568841522).

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

1220209998 is a wasteful number, since it uses less digits than its factorization.

1220209998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29052631.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 1220209998 is about 34931.5043764222. The cubic root of 1220209998 is about 1068.5910351305.

The spelling of 1220209998 in words is "one billion, two hundred twenty million, two hundred nine thousand, nine hundred ninety-eight".