12161398 has 4 divisors (see below), whose sum is σ = 18242100. Its totient is φ = 6080698.

The previous prime is 12161351. The next prime is 12161417. The reversal of 12161398 is 89316121.

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

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 as a sum of consecutive naturals, namely, 3040348 + ... + 3040351.

It is an arithmetic number, because the mean of its divisors is an integer number (4560525).

Almost surely, 2^12161398 is an apocalyptic number.

12161398 is a deficient number, since it is larger than the sum of its proper divisors (6080702).

12161398 is an equidigital number, since it uses as much as digits as its factorization.

12161398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6080701.

The product of its digits is 2592, while the sum is 31.

The square root of 12161398 is about 3487.3196010690. The cubic root of 12161398 is about 229.9646952742.

The spelling of 12161398 in words is "twelve million, one hundred sixty-one thousand, three hundred ninety-eight".