12776945 has 16 divisors (see below), whose sum is σ = 16339968. Its totient is φ = 9557760.

The previous prime is 12776941. The next prime is 12776957. The reversal of 12776945 is 54967721.

It is not a de Polignac number, because 12776945 - 2² = 12776941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12776941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15842 + ... + 16628.

It is an arithmetic number, because the mean of its divisors is an integer number (1021248).

Almost surely, 2^12776945 is an apocalyptic number.

It is an amenable number.

12776945 is a deficient number, since it is larger than the sum of its proper divisors (3563023).

12776945 is a wasteful number, since it uses less digits than its factorization.

12776945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its digits is 105840, while the sum is 41.

The square root of 12776945 is about 3574.4852776309. The cubic root of 12776945 is about 233.7808904242.

The spelling of 12776945 in words is "twelve million, seven hundred seventy-six thousand, nine hundred forty-five".