12398154409 has 3 divisors (see below), whose sum is σ = 12398265757. Its totient is φ = 12398043062.

The previous prime is 12398154407. The next prime is 12398154481. The reversal of 12398154409 is 90445189321.

The square root of 12398154409 is 111347.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12398154409 - 2¹ = 12398154407 is a prime.

It is a super-2 number, since 2×12398154409² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12398154407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55674 + ... + 167020.

Almost surely, 2^12398154409 is an apocalyptic number.

12398154409 is the 111347-th square number.

12398154409 is the 55674-th centered octagonal number.

It is an amenable number.

12398154409 is a deficient number, since it is larger than the sum of its proper divisors (111348).

12398154409 is an frugal number, since it uses more digits than its factorization.

12398154409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222694 (or 111347 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 12398154409 in words is "twelve billion, three hundred ninety-eight million, one hundred fifty-four thousand, four hundred nine".