1398220238 has 4 divisors (see below), whose sum is σ = 2097330360. Its totient is φ = 699110118.

The previous prime is 1398220231. The next prime is 1398220259. The reversal of 1398220238 is 8320228931.

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 (1398220231) 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 as a sum of consecutive naturals, namely, 349555058 + ... + 349555061.

It is an arithmetic number, because the mean of its divisors is an integer number (524332590).

Almost surely, 2^1398220238 is an apocalyptic number.

1398220238 is a deficient number, since it is larger than the sum of its proper divisors (699110122).

1398220238 is an equidigital number, since it uses as much as digits as its factorization.

1398220238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699110121.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1398220238 is about 37392.7832342018. The cubic root of 1398220238 is about 1118.2146934249.

The spelling of 1398220238 in words is "one billion, three hundred ninety-eight million, two hundred twenty thousand, two hundred thirty-eight".