1780023 has 12 divisors (see below), whose sum is σ = 2761080. Its totient is φ = 1017072.

The previous prime is 1780021. The next prime is 1780027. The reversal of 1780023 is 3200871.

It is not a de Polignac number, because 1780023 - 2¹ = 1780021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

1780023 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780021) 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, 5908 + ... + 6201.

It is an arithmetic number, because the mean of its divisors is an integer number (230090).

2^1780023 is an apocalyptic number.

1780023 is a deficient number, since it is larger than the sum of its proper divisors (981057).

1780023 is a wasteful number, since it uses less digits than its factorization.

1780023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12126 (or 12119 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1780023 is about 1334.1750259992. The cubic root of 1780023 is about 121.1923493956.

Adding to 1780023 its reverse (3200871), we get a palindrome (4980894).

The spelling of 1780023 in words is "one million, seven hundred eighty thousand, twenty-three".