12291398 has 16 divisors (see below), whose sum is σ = 21184800. Its totient is φ = 5239296.

The previous prime is 12291379. The next prime is 12291403. The reversal of 12291398 is 89319221.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428 + ... + 4976.

It is an arithmetic number, because the mean of its divisors is an integer number (1324050).

Almost surely, 2^12291398 is an apocalyptic number.

12291398 is a deficient number, since it is larger than the sum of its proper divisors (8893402).

12291398 is a wasteful number, since it uses less digits than its factorization.

12291398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4751.

The product of its digits is 7776, while the sum is 35.

The square root of 12291398 is about 3505.9090119397. The cubic root of 12291398 is about 230.7811999661.

The spelling of 12291398 in words is "twelve million, two hundred ninety-one thousand, three hundred ninety-eight".