12720905 has 8 divisors (see below), whose sum is σ = 15620352. Its totient is φ = 9939888.

The previous prime is 12720889. The next prime is 12720941. The reversal of 12720905 is 50902721.

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

It is a cyclic number.

It is not a de Polignac number, because 12720905 - 2⁴ = 12720889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29369 + ... + 29798.

It is an arithmetic number, because the mean of its divisors is an integer number (1952544).

Almost surely, 2^12720905 is an apocalyptic number.

It is an amenable number.

12720905 is a deficient number, since it is larger than the sum of its proper divisors (2899447).

12720905 is an equidigital number, since it uses as much as digits as its factorization.

12720905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59215.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 12720905 is about 3566.6377724686. The cubic root of 12720905 is about 233.4385998949.

The spelling of 12720905 in words is "twelve million, seven hundred twenty thousand, nine hundred five".