11280381 has 16 divisors (see below), whose sum is σ = 17240064. Its totient is φ = 6426864.

The previous prime is 11280377. The next prime is 11280397. The reversal of 11280381 is 18308211.

It is not a de Polignac number, because 11280381 - 2² = 11280377 is a prime.

It is a super-2 number, since 2×11280381² = 254493991010322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11280341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9676 + ... + 10778.

It is an arithmetic number, because the mean of its divisors is an integer number (1077504).

Almost surely, 2^11280381 is an apocalyptic number.

It is an amenable number.

11280381 is a deficient number, since it is larger than the sum of its proper divisors (5959683).

11280381 is a wasteful number, since it uses less digits than its factorization.

11280381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 11280381 is about 3358.6278448200. The cubic root of 11280381 is about 224.2717590795.

Adding to 11280381 its reverse (18308211), we get a palindrome (29588592).

The spelling of 11280381 in words is "eleven million, two hundred eighty thousand, three hundred eighty-one".