1428280239 has 4 divisors (see below), whose sum is σ = 1904373656. Its totient is φ = 952186824.

The previous prime is 1428280213. The next prime is 1428280367. The reversal of 1428280239 is 9320828241.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1428280239 - 2¹⁹ = 1427755951 is a prime.

It is a super-2 number, since 2×1428280239² = 4079968882235794242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1428280197 and 1428280206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428282239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238046704 + ... + 238046709.

It is an arithmetic number, because the mean of its divisors is an integer number (476093414).

Almost surely, 2^1428280239 is an apocalyptic number.

1428280239 is a deficient number, since it is larger than the sum of its proper divisors (476093417).

1428280239 is an equidigital number, since it uses as much as digits as its factorization.

1428280239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476093416.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 1428280239 is about 37792.5950286561. The cubic root of 1428280239 is about 1126.1713531950.

The spelling of 1428280239 in words is "one billion, four hundred twenty-eight million, two hundred eighty thousand, two hundred thirty-nine".