12721977 has 12 divisors (see below), whose sum is σ = 18678244. Its totient is φ = 8341920.

The previous prime is 12721939. The next prime is 12721999. The reversal of 12721977 is 77912721.

12721977 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 254016 + 12467961 = 504^2 + 3531^2 .

It is not a de Polignac number, because 12721977 - 2⁸ = 12721721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11038 + ... + 12135.

Almost surely, 2^12721977 is an apocalyptic number.

It is an amenable number.

12721977 is a deficient number, since it is larger than the sum of its proper divisors (5956267).

12721977 is a wasteful number, since it uses less digits than its factorization.

12721977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23240 (or 23237 counting only the distinct ones).

The product of its digits is 12348, while the sum is 36.

The square root of 12721977 is about 3566.7880508940. The cubic root of 12721977 is about 233.4451570581.

It can be divided in two parts, 1272 and 1977, that added together give a square (3249 = 57²).

The spelling of 12721977 in words is "twelve million, seven hundred twenty-one thousand, nine hundred seventy-seven".