1221419798 has 4 divisors (see below), whose sum is σ = 1832129700. Its totient is φ = 610709898.

The previous prime is 1221419789. The next prime is 1221419803. The reversal of 1221419798 is 8979141221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305354948 + ... + 305354951.

It is an arithmetic number, because the mean of its divisors is an integer number (458032425).

Almost surely, 2^1221419798 is an apocalyptic number.

1221419798 is a deficient number, since it is larger than the sum of its proper divisors (610709902).

1221419798 is an equidigital number, since it uses as much as digits as its factorization.

1221419798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610709901.

The product of its digits is 72576, while the sum is 44.

The square root of 1221419798 is about 34948.8168326197. The cubic root of 1221419798 is about 1068.9440766619.

The spelling of 1221419798 in words is "one billion, two hundred twenty-one million, four hundred nineteen thousand, seven hundred ninety-eight".