1428188249 has 4 divisors (see below), whose sum is σ = 1428410640. Its totient is φ = 1427965860.

The previous prime is 1428188231. The next prime is 1428188263. The reversal of 1428188249 is 9428818241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9428818241 = 307 ⋅30712763.

It is a cyclic number.

It is not a de Polignac number, because 1428188249 - 2¹⁶ = 1428122713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428188269) 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 3 ways as a sum of consecutive naturals, for example, 101267 + ... + 114504.

It is an arithmetic number, because the mean of its divisors is an integer number (357102660).

Almost surely, 2^1428188249 is an apocalyptic number.

It is an amenable number.

1428188249 is a deficient number, since it is larger than the sum of its proper divisors (222391).

1428188249 is an equidigital number, since it uses as much as digits as its factorization.

1428188249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222390.

The product of its digits is 294912, while the sum is 47.

The square root of 1428188249 is about 37791.3779717014. The cubic root of 1428188249 is about 1126.1471752305.

The spelling of 1428188249 in words is "one billion, four hundred twenty-eight million, one hundred eighty-eight thousand, two hundred forty-nine".