12720146 has 8 divisors (see below), whose sum is σ = 19122480. Its totient is φ = 6345988.

The previous prime is 12720133. The next prime is 12720157. The reversal of 12720146 is 64102721.

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

It is a super-2 number, since 2×12720146² = 323604228522632, which contains 22 as substring.

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, 5876 + ... + 7743.

It is an arithmetic number, because the mean of its divisors is an integer number (2390310).

Almost surely, 2^12720146 is an apocalyptic number.

12720146 is a deficient number, since it is larger than the sum of its proper divisors (6402334).

12720146 is a wasteful number, since it uses less digits than its factorization.

12720146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14088.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 12720146 is about 3566.5313681503. The cubic root of 12720146 is about 233.4339570538.

Adding to 12720146 its reverse (64102721), we get a palindrome (76822867).

The spelling of 12720146 in words is "twelve million, seven hundred twenty thousand, one hundred forty-six".