11720817 has 6 divisors (see below), whose sum is σ = 16930082. Its totient is φ = 7813872.

The previous prime is 11720809. The next prime is 11720851. The reversal of 11720817 is 71802711.

11720817 is digitally balanced in base 2 and base 4, 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 only one way, i.e., 11451456 + 269361 = 3384^2 + 519^2 .

It is not a de Polignac number, because 11720817 - 2³ = 11720809 is a prime.

It is a super-2 number, since 2×11720817² = 274755102294978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11720117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 651148 + ... + 651165.

Almost surely, 2^11720817 is an apocalyptic number.

It is an amenable number.

11720817 is a deficient number, since it is larger than the sum of its proper divisors (5209265).

11720817 is a wasteful number, since it uses less digits than its factorization.

11720817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302319 (or 1302316 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 11720817 is about 3423.5678757694. The cubic root of 11720817 is about 227.1534279439.

The spelling of 11720817 in words is "eleven million, seven hundred twenty thousand, eight hundred seventeen".