12197890 has 8 divisors (see below), whose sum is σ = 21956220. Its totient is φ = 4879152.

The previous prime is 12197879. The next prime is 12197903. The reversal of 12197890 is 9879121.

It can be written as a sum of positive squares in 2 ways, for example, as 12061729 + 136161 = 3473^2 + 369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609885 + ... + 609904.

Almost surely, 2^12197890 is an apocalyptic number.

12197890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12197890 is a deficient number, since it is larger than the sum of its proper divisors (9758330).

12197890 is a wasteful number, since it uses less digits than its factorization.

12197890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219796.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12197890 is about 3492.5477806324. The cubic root of 12197890 is about 230.1944794913.

The spelling of 12197890 in words is "twelve million, one hundred ninety-seven thousand, eight hundred ninety".