12997945 has 16 divisors (see below), whose sum is σ = 17087760. Its totient is φ = 9447424.

The previous prime is 12997939. The next prime is 12997961. The reversal of 12997945 is 54979921.

It is a happy number.

12997945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 95481 + 12902464 = 309^2 + 3592^2 .

It is a cyclic number.

It is not a de Polignac number, because 12997945 - 2³ = 12997937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12997895 and 12997904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172 + ... + 5101.

It is an arithmetic number, because the mean of its divisors is an integer number (1067985).

Almost surely, 2^12997945 is an apocalyptic number.

It is an amenable number.

12997945 is a deficient number, since it is larger than the sum of its proper divisors (4089815).

12997945 is a wasteful number, since it uses less digits than its factorization.

12997945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5324.

The product of its digits is 204120, while the sum is 46.

The square root of 12997945 is about 3605.2662869752. The cubic root of 12997945 is about 235.1210783941.

The spelling of 12997945 in words is "twelve million, nine hundred ninety-seven thousand, nine hundred forty-five".