1809423 has 36 divisors (see below), whose sum is σ = 3325608. Its totient is φ = 937440.

The previous prime is 1809421. The next prime is 1809449. The reversal of 1809423 is 3249081.

It is not a de Polignac number, because 1809423 - 2¹ = 1809421 is a prime.

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 35 ways as a sum of consecutive naturals, for example, 4665 + ... + 5037.

It is an arithmetic number, because the mean of its divisors is an integer number (92378).

2^1809423 is an apocalyptic number.

1809423 is a deficient number, since it is larger than the sum of its proper divisors (1516185).

1809423 is a wasteful number, since it uses less digits than its factorization.

1809423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1809423 is about 1345.1479472534. The cubic root of 1809423 is about 121.8559394255.

The spelling of 1809423 in words is "one million, eight hundred nine thousand, four hundred twenty-three".