11665397 has 4 divisors (see below), whose sum is σ = 11980716. Its totient is φ = 11350080.

The previous prime is 11665391. The next prime is 11665403. The reversal of 11665397 is 79356611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79356611 = 1277 ⋅62143.

It is an interprime number because it is at equal distance from previous prime (11665391) and next prime (11665403).

It can be written as a sum of positive squares in 2 ways, for example, as 11015761 + 649636 = 3319^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 11665397 - 2⁶ = 11665333 is a prime.

It is a super-3 number, since 3×11665397³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11665397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665391) 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, 157604 + ... + 157677.

It is an arithmetic number, because the mean of its divisors is an integer number (2995179).

Almost surely, 2^11665397 is an apocalyptic number.

It is an amenable number.

11665397 is a deficient number, since it is larger than the sum of its proper divisors (315319).

11665397 is an equidigital number, since it uses as much as digits as its factorization.

11665397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315318.

The product of its digits is 34020, while the sum is 38.

The square root of 11665397 is about 3415.4643900940. The cubic root of 11665397 is about 226.7948426819.

The spelling of 11665397 in words is "eleven million, six hundred sixty-five thousand, three hundred ninety-seven".