1428561 has 12 divisors (see below), whose sum is σ = 2185092. Its totient is φ = 896256.

The previous prime is 1428541. The next prime is 1428571. The reversal of 1428561 is 1658241.

1428561 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 1252161 + 176400 = 1119^2 + 420^2 .

It is not a de Polignac number, because 1428561 - 2⁵ = 1428529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1428521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4516 + ... + 4821.

It is an arithmetic number, because the mean of its divisors is an integer number (182091).

2^1428561 is an apocalyptic number.

It is an amenable number.

1428561 is a deficient number, since it is larger than the sum of its proper divisors (756531).

1428561 is a wasteful number, since it uses less digits than its factorization.

1428561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9360 (or 9357 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1428561 is about 1195.2242467420. The cubic root of 1428561 is about 112.6245139900.

It can be divided in two parts, 1428 and 561, that multiplied together give a palindrome (801108).

The spelling of 1428561 in words is "one million, four hundred twenty-eight thousand, five hundred sixty-one".