1228381 has 24 divisors (see below), whose sum is σ = 1625184. Its totient is φ = 917280.

The previous prime is 1228373. The next prime is 1228391. The reversal of 1228381 is 1838221.

It is not a de Polignac number, because 1228381 - 2³ = 1228373 is a prime.

It is a super-2 number, since 2×1228381² = 3017839762322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228351) 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 23 ways as a sum of consecutive naturals, for example, 23151 + ... + 23203.

It is an arithmetic number, because the mean of its divisors is an integer number (67716).

2^1228381 is an apocalyptic number.

1228381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1228381 is a deficient number, since it is larger than the sum of its proper divisors (396803).

1228381 is a wasteful number, since it uses less digits than its factorization.

1228381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 114 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 1228381 is about 1108.3235087284. The cubic root of 1228381 is about 107.0970964796.

The spelling of 1228381 in words is "one million, two hundred twenty-eight thousand, three hundred eighty-one".