1228739198 has 4 divisors (see below), whose sum is σ = 1843108800. Its totient is φ = 614369598.

The previous prime is 1228739191. The next prime is 1228739201. The reversal of 1228739198 is 8919378221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228739191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307184798 + ... + 307184801.

It is an arithmetic number, because the mean of its divisors is an integer number (460777200).

Almost surely, 2^1228739198 is an apocalyptic number.

1228739198 is a deficient number, since it is larger than the sum of its proper divisors (614369602).

1228739198 is an equidigital number, since it uses as much as digits as its factorization.

1228739198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614369601.

The product of its digits is 435456, while the sum is 50.

The square root of 1228739198 is about 35053.3764136923. The cubic root of 1228739198 is about 1071.0750536672.

The spelling of 1228739198 in words is "one billion, two hundred twenty-eight million, seven hundred thirty-nine thousand, one hundred ninety-eight".