1219905998 has 8 divisors (see below), whose sum is σ = 1830021960. Its totient is φ = 609898680.

The previous prime is 1219905997. The next prime is 1219906003. The reversal of 1219905998 is 8995099121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219905991) 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, 12488 + ... + 50948.

It is an arithmetic number, because the mean of its divisors is an integer number (228752745).

Almost surely, 2^1219905998 is an apocalyptic number.

1219905998 is a deficient number, since it is larger than the sum of its proper divisors (610115962).

1219905998 is a wasteful number, since it uses less digits than its factorization.

1219905998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54322.

The product of its (nonzero) digits is 524880, while the sum is 53.

The square root of 1219905998 is about 34927.1527325088. The cubic root of 1219905998 is about 1068.5022857468.

The spelling of 1219905998 in words is "one billion, two hundred nineteen million, nine hundred five thousand, nine hundred ninety-eight".