1428239 has 4 divisors (see below), whose sum is σ = 1449624. Its totient is φ = 1406856.

The previous prime is 1428233. The next prime is 1428247. The reversal of 1428239 is 9328241.

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

It is a cyclic number.

It is not a de Polignac number, because 1428239 - 2²⁰ = 379663 is a prime.

It is a super-2 number, since 2×1428239² = 4079733282242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10592 + ... + 10725.

It is an arithmetic number, because the mean of its divisors is an integer number (362406).

2^1428239 is an apocalyptic number.

1428239 is a deficient number, since it is larger than the sum of its proper divisors (21385).

1428239 is an equidigital number, since it uses as much as digits as its factorization.

1428239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21384.

The product of its digits is 3456, while the sum is 29.

The square root of 1428239 is about 1195.0895363947. The cubic root of 1428239 is about 112.6160514373.

The spelling of 1428239 in words is "one million, four hundred twenty-eight thousand, two hundred thirty-nine".