1428885 has 24 divisors (see below), whose sum is σ = 2507544. Its totient is φ = 752640.

The previous prime is 1428863. The next prime is 1428887. The reversal of 1428885 is 5888241.

It can be written as a sum of positive squares in 4 ways, for example, as 10404 + 1418481 = 102^2 + 1191^2 .

It is not a de Polignac number, because 1428885 - 2⁵ = 1428853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4945 + ... + 5225.

It is an arithmetic number, because the mean of its divisors is an integer number (104481).

2^1428885 is an apocalyptic number.

1428885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1428885 is a deficient number, since it is larger than the sum of its proper divisors (1078659).

1428885 is a wasteful number, since it uses less digits than its factorization.

1428885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 402 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 1428885 is about 1195.3597784768. The cubic root of 1428885 is about 112.6330278218.

The spelling of 1428885 in words is "one million, four hundred twenty-eight thousand, eight hundred eighty-five".