12720969 has 10 divisors (see below), whose sum is σ = 19003050. Its totient is φ = 8480592.

The previous prime is 12720949. The next prime is 12720971. The reversal of 12720969 is 96902721.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 82944 = 3555^2 + 288^2 .

It is not a de Polignac number, because 12720969 - 2⁸ = 12720713 is a prime.

It is a super-2 number, since 2×12720969² = 323646104597922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12720949) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 78444 + ... + 78605.

It is an arithmetic number, because the mean of its divisors is an integer number (1900305).

Almost surely, 2^12720969 is an apocalyptic number.

It is an amenable number.

12720969 is a deficient number, since it is larger than the sum of its proper divisors (6282081).

12720969 is an equidigital number, since it uses as much as digits as its factorization.

12720969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157061 (or 157052 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 12720969 is about 3566.6467444926. The cubic root of 12720969 is about 233.4389913777.

It can be divided in two parts, 12720 and 969, that added together give a square (13689 = 117²).

The spelling of 12720969 in words is "twelve million, seven hundred twenty thousand, nine hundred sixty-nine".