12977645 has 8 divisors (see below), whose sum is σ = 16110360. Its totient is φ = 10024000.

The previous prime is 12977617. The next prime is 12977651. The reversal of 12977645 is 54677921.

12977645 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 4 ways, for example, as 5299204 + 7678441 = 2302^2 + 2771^2 .

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

It is not a de Polignac number, because 12977645 - 2¹⁸ = 12715501 is a prime.

It is a super-3 number, since 3×12977645³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

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, 44606 + ... + 44895.

It is an arithmetic number, because the mean of its divisors is an integer number (2013795).

Almost surely, 2^12977645 is an apocalyptic number.

It is an amenable number.

12977645 is a deficient number, since it is larger than the sum of its proper divisors (3132715).

12977645 is an equidigital number, since it uses as much as digits as its factorization.

12977645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89535.

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

The square root of 12977645 is about 3602.4498608586. The cubic root of 12977645 is about 234.9986117317.

The spelling of 12977645 in words is "twelve million, nine hundred seventy-seven thousand, six hundred forty-five".