12720697 has 4 divisors (see below), whose sum is σ = 13877136. Its totient is φ = 11564260.

The previous prime is 12720649. The next prime is 12720707. The reversal of 12720697 is 79602721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12720697 - 2⁷ = 12720569 is a prime.

It is a super-2 number, since 2×12720697² = 323632264331618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578203 + ... + 578224.

It is an arithmetic number, because the mean of its divisors is an integer number (3469284).

Almost surely, 2^12720697 is an apocalyptic number.

It is an amenable number.

12720697 is a deficient number, since it is larger than the sum of its proper divisors (1156439).

12720697 is a wasteful number, since it uses less digits than its factorization.

12720697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156438.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 12720697 is about 3566.6086132347. The cubic root of 12720697 is about 233.4373275669.

The spelling of 12720697 in words is "twelve million, seven hundred twenty thousand, six hundred ninety-seven".