1808522 has 4 divisors (see below), whose sum is σ = 2712786. Its totient is φ = 904260.

The previous prime is 1808507. The next prime is 1808539. The reversal of 1808522 is 2258081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2258081 = 7 ⋅322583.

It can be written as a sum of positive squares in only one way, i.e., 1104601 + 703921 = 1051^2 + 839^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1808491 and 1808500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452129 + ... + 452132.

2^1808522 is an apocalyptic number.

1808522 is a deficient number, since it is larger than the sum of its proper divisors (904264).

1808522 is an equidigital number, since it uses as much as digits as its factorization.

1808522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904263.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 1808522 is about 1344.8129981525. The cubic root of 1808522 is about 121.8357100614.

The spelling of 1808522 in words is "one million, eight hundred eight thousand, five hundred twenty-two".