12197979 has 16 divisors (see below), whose sum is σ = 18135040. Its totient is φ = 8103240.

The previous prime is 12197971. The next prime is 12197989. The reversal of 12197979 is 97979121.

It is not a de Polignac number, because 12197979 - 2³ = 12197971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12197971) 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 15 ways as a sum of consecutive naturals, for example, 9294 + ... + 10524.

It is an arithmetic number, because the mean of its divisors is an integer number (1133440).

Almost surely, 2^12197979 is an apocalyptic number.

12197979 is a deficient number, since it is larger than the sum of its proper divisors (5937061).

12197979 is a wasteful number, since it uses less digits than its factorization.

12197979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607 (or 1601 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 12197979 is about 3492.5605220239. The cubic root of 12197979 is about 230.1950393493.

The spelling of 12197979 in words is "twelve million, one hundred ninety-seven thousand, nine hundred seventy-nine".