1428111243 has 24 divisors (see below), whose sum is σ = 2303789488. Its totient is φ = 878835744.

The previous prime is 1428111233. The next prime is 1428111257. The reversal of 1428111243 is 3421118241.

It is not a de Polignac number, because 1428111243 - 2⁸ = 1428110987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1428111233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222880 + ... + 229197.

Almost surely, 2^1428111243 is an apocalyptic number.

1428111243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1428111243 is a deficient number, since it is larger than the sum of its proper divisors (875678245).

1428111243 is an equidigital number, since it uses as much as digits as its factorization.

1428111243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452105 (or 452093 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1428111243 is about 37790.3591276929. The cubic root of 1428111243 is about 1126.1269347502.

Adding to 1428111243 its reverse (3421118241), we get a palindrome (4849229484).

The spelling of 1428111243 in words is "one billion, four hundred twenty-eight million, one hundred eleven thousand, two hundred forty-three".