1218398 has 4 divisors (see below), whose sum is σ = 1827600. Its totient is φ = 609198.

The previous prime is 1218391. The next prime is 1218401. The reversal of 1218398 is 8938121.

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 (1218391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304598 + ... + 304601.

It is an arithmetic number, because the mean of its divisors is an integer number (456900).

2^1218398 is an apocalyptic number.

1218398 is a deficient number, since it is larger than the sum of its proper divisors (609202).

1218398 is an equidigital number, since it uses as much as digits as its factorization.

1218398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609201.

The product of its digits is 3456, while the sum is 32.

The square root of 1218398 is about 1103.8106721716. The cubic root of 1218398 is about 106.8061824567.

The spelling of 1218398 in words is "one million, two hundred eighteen thousand, three hundred ninety-eight".