1228533839 has 32 divisors (see below), whose sum is σ = 1381161600. Its totient is φ = 1092199680.

The previous prime is 1228533833. The next prime is 1228533919. The reversal of 1228533839 is 9383358221.

It is not a de Polignac number, because 1228533839 - 2¹⁶ = 1228468303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1228533839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228533833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11927462 + ... + 11927564.

It is an arithmetic number, because the mean of its divisors is an integer number (43161300).

Almost surely, 2^1228533839 is an apocalyptic number.

1228533839 is a deficient number, since it is larger than the sum of its proper divisors (152627761).

1228533839 is an equidigital number, since it uses as much as digits as its factorization.

1228533839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 266 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 1228533839 is about 35050.4470584899. The cubic root of 1228533839 is about 1071.0153808044.

The spelling of 1228533839 in words is "one billion, two hundred twenty-eight million, five hundred thirty-three thousand, eight hundred thirty-nine".