12977905 has 8 divisors (see below), whose sum is σ = 15633000. Its totient is φ = 10342656.

The previous prime is 12977879. The next prime is 12977927. The reversal of 12977905 is 50977921.

It can be written as a sum of positive squares in 4 ways, for example, as 361201 + 12616704 = 601^2 + 3552^2 .

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 12977905 - 2¹⁷ = 12846833 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3480 + ... + 6169.

It is an arithmetic number, because the mean of its divisors is an integer number (1954125).

Almost surely, 2^12977905 is an apocalyptic number.

It is an amenable number.

12977905 is a deficient number, since it is larger than the sum of its proper divisors (2655095).

12977905 is an equidigital number, since it uses as much as digits as its factorization.

12977905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9923.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 12977905 is about 3602.4859472314. The cubic root of 12977905 is about 235.0001810773. Note that the first 3 decimals are identical.

The spelling of 12977905 in words is "twelve million, nine hundred seventy-seven thousand, nine hundred five".