1809428 has 12 divisors (see below), whose sum is σ = 3181332. Its totient is φ = 900480.

The previous prime is 1809421. The next prime is 1809449. The reversal of 1809428 is 8249081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1249924 + 559504 = 1118^2 + 748^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1809394 and 1809403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809421) 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, 26 + ... + 1902.

It is an arithmetic number, because the mean of its divisors is an integer number (265111).

2^1809428 is an apocalyptic number.

It is an amenable number.

1809428 is a deficient number, since it is larger than the sum of its proper divisors (1371904).

1809428 is a wasteful number, since it uses less digits than its factorization.

1809428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122 (or 2120 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1809428 is about 1345.1498057837. The cubic root of 1809428 is about 121.8560516674.

The spelling of 1809428 in words is "one million, eight hundred nine thousand, four hundred twenty-eight".