1808042 has 16 divisors (see below), whose sum is σ = 2844072. Its totient is φ = 861120.

The previous prime is 1808041. The next prime is 1808071. The reversal of 1808042 is 2408081.

It can be written as a sum of positive squares in 4 ways, for example, as 1771561 + 36481 = 1331^2 + 191^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1807999 and 1808017.

It is not an unprimeable number, because it can be changed into a prime (1808041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3692 + ... + 4152.

2^1808042 is an apocalyptic number.

1808042 is a deficient number, since it is larger than the sum of its proper divisors (1036030).

1808042 is a wasteful number, since it uses less digits than its factorization.

1808042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 1808042 is about 1344.6345228351. The cubic root of 1808042 is about 121.8249302984.

The spelling of 1808042 in words is "one million, eight hundred eight thousand, forty-two".