11646399 has 4 divisors (see below), whose sum is σ = 15528536. Its totient is φ = 7764264.

The previous prime is 11646391. The next prime is 11646403. The reversal of 11646399 is 99364611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99364611 = 3 ⋅33121537.

It is not a de Polignac number, because 11646399 - 2³ = 11646391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11646391) 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, 1941064 + ... + 1941069.

It is an arithmetic number, because the mean of its divisors is an integer number (3882134).

Almost surely, 2^11646399 is an apocalyptic number.

11646399 is a deficient number, since it is larger than the sum of its proper divisors (3882137).

11646399 is an equidigital number, since it uses as much as digits as its factorization.

11646399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3882136.

The product of its digits is 34992, while the sum is 39.

The square root of 11646399 is about 3412.6820830543. The cubic root of 11646399 is about 226.6716581465.

The spelling of 11646399 in words is "eleven million, six hundred forty-six thousand, three hundred ninety-nine".