1642823 has 12 divisors (see below), whose sum is σ = 2058840. Its totient is φ = 1299312.

The previous prime is 1642813. The next prime is 1642831. The reversal of 1642823 is 3282461.

It is not a de Polignac number, because 1642823 - 2⁴ = 1642807 is a prime.

It is an Ulam number.

It is a zygodrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 1642792 and 1642801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642813) 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, 653 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (171570).

2^1642823 is an apocalyptic number.

1642823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1642823 is a deficient number, since it is larger than the sum of its proper divisors (416017).

1642823 is a wasteful number, since it uses less digits than its factorization.

1642823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606 (or 2599 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 1642823 is about 1281.7265699048. The cubic root of 1642823 is about 117.9949964363.

The spelling of 1642823 in words is "one million, six hundred forty-two thousand, eight hundred twenty-three".