11280905 has 4 divisors (see below), whose sum is σ = 13537092. Its totient is φ = 9024720.

The previous prime is 11280883. The next prime is 11280937. The reversal of 11280905 is 50908211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50908211 = 1399 ⋅36389.

It can be written as a sum of positive squares in 2 ways, for example, as 1646089 + 9634816 = 1283^2 + 3104^2 .

It is not a de Polignac number, because 11280905 - 2¹⁴ = 11264521 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128086 + ... + 1128095.

It is an arithmetic number, because the mean of its divisors is an integer number (3384273).

Almost surely, 2^11280905 is an apocalyptic number.

It is an amenable number.

11280905 is a deficient number, since it is larger than the sum of its proper divisors (2256187).

11280905 is an equidigital number, since it uses as much as digits as its factorization.

11280905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256186.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 11280905 is about 3358.7058519614. The cubic root of 11280905 is about 224.2752316744.

The spelling of 11280905 in words is "eleven million, two hundred eighty thousand, nine hundred five".