11428555 has 4 divisors (see below), whose sum is σ = 13714272. Its totient is φ = 9142840.

The previous prime is 11428531. The next prime is 11428559. The reversal of 11428555 is 55582411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55582411 = 31 ⋅1792981.

It is not a de Polignac number, because 11428555 - 2⁷ = 11428427 is a prime.

It is a super-2 number, since 2×11428555² = 261223738776050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11428559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142851 + ... + 1142860.

It is an arithmetic number, because the mean of its divisors is an integer number (3428568).

Almost surely, 2^11428555 is an apocalyptic number.

11428555 is a deficient number, since it is larger than the sum of its proper divisors (2285717).

11428555 is an equidigital number, since it uses as much as digits as its factorization.

11428555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285716.

The product of its digits is 8000, while the sum is 31.

The square root of 11428555 is about 3380.6145890947. The cubic root of 11428555 is about 225.2494681566.

The spelling of 11428555 in words is "eleven million, four hundred twenty-eight thousand, five hundred fifty-five".