1808069 has 4 divisors (see below), whose sum is σ = 1914444. Its totient is φ = 1701696.

The previous prime is 1808041. The next prime is 1808071. The reversal of 1808069 is 9608081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9608081 = 7 ⋅1372583.

It can be written as a sum of positive squares in 2 ways, for example, as 1677025 + 131044 = 1295^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808069 - 2¹² = 1803973 is a prime.

It is a super-2 number, since 2×1808069² = 6538227017522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808029) 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, 53162 + ... + 53195.

It is an arithmetic number, because the mean of its divisors is an integer number (478611).

2^1808069 is an apocalyptic number.

It is an amenable number.

1808069 is a deficient number, since it is larger than the sum of its proper divisors (106375).

1808069 is a wasteful number, since it uses less digits than its factorization.

1808069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106374.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1808069 is about 1344.6445627005. The cubic root of 1808069 is about 121.8255367107.

The spelling of 1808069 in words is "one million, eight hundred eight thousand, sixty-nine".