1801822 has 8 divisors (see below), whose sum is σ = 2948472. Its totient is φ = 819000.

The previous prime is 1801819. The next prime is 1801823. The reversal of 1801822 is 2281081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 81901 = 1801822 / (1 + 8 + 0 + 1 + 8 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 1801793 and 1801802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801823) 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, 40929 + ... + 40972.

It is an arithmetic number, because the mean of its divisors is an integer number (368559).

2^1801822 is an apocalyptic number.

1801822 is the 718-th centered heptagonal number.

1801822 is a deficient number, since it is larger than the sum of its proper divisors (1146650).

1801822 is a wasteful number, since it uses less digits than its factorization.

1801822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81914.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1801822 is about 1342.3196340663. The cubic root of 1801822 is about 121.6850696710.

It can be divided in two parts, 180 and 1822, that added together give a palindrome (2002).

The spelling of 1801822 in words is "one million, eight hundred one thousand, eight hundred twenty-two".