1428345 has 12 divisors (see below), whose sum is σ = 2475876. Its totient is φ = 761760.

The previous prime is 1428281. The next prime is 1428359. The reversal of 1428345 is 5438241.

It can be written as a sum of positive squares in 2 ways, for example, as 767376 + 660969 = 876^2 + 813^2 .

It is not a de Polignac number, because 1428345 - 2⁶ = 1428281 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15826 + ... + 15915.

It is an arithmetic number, because the mean of its divisors is an integer number (206323).

2^1428345 is an apocalyptic number.

1428345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1428345 is a deficient number, since it is larger than the sum of its proper divisors (1047531).

1428345 is a wasteful number, since it uses less digits than its factorization.

1428345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31752 (or 31749 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 1428345 is about 1195.1338837135. The cubic root of 1428345 is about 112.6188373870.

The spelling of 1428345 in words is "one million, four hundred twenty-eight thousand, three hundred forty-five".