11428643 has 4 divisors (see below), whose sum is σ = 11439120. Its totient is φ = 11418168.

The previous prime is 11428621. The next prime is 11428649. The reversal of 11428643 is 34682411.

11428643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34682411 = 1567 ⋅22133.

It is a cyclic number.

It is not a de Polignac number, because 11428643 - 2¹⁴ = 11412259 is a prime.

It is a super-2 number, since 2×11428643² = 261227761642898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11428649) 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, 3383 + ... + 5856.

It is an arithmetic number, because the mean of its divisors is an integer number (2859780).

Almost surely, 2^11428643 is an apocalyptic number.

11428643 is a deficient number, since it is larger than the sum of its proper divisors (10477).

11428643 is an equidigital number, since it uses as much as digits as its factorization.

11428643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10476.

The product of its digits is 4608, while the sum is 29.

The square root of 11428643 is about 3380.6276044545. The cubic root of 11428643 is about 225.2500462962.

The spelling of 11428643 in words is "eleven million, four hundred twenty-eight thousand, six hundred forty-three".