1215198 has 12 divisors (see below), whose sum is σ = 2632968. Its totient is φ = 405060.

The previous prime is 1215197. The next prime is 1215209. The reversal of 1215198 is 8915121.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33738 + ... + 33773.

It is an arithmetic number, because the mean of its divisors is an integer number (219414).

2^1215198 is an apocalyptic number.

1215198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1215198 is an abundant number, since it is smaller than the sum of its proper divisors (1417770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215198 is a wasteful number, since it uses less digits than its factorization.

1215198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67519 (or 67516 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1215198 is about 1102.3601952175. The cubic root of 1215198 is about 106.7125952386.

The spelling of 1215198 in words is "one million, two hundred fifteen thousand, one hundred ninety-eight".