1809408 has 88 divisors (see below), whose sum is σ = 5240320. Its totient is φ = 552960.

The previous prime is 1809403. The next prime is 1809413. The reversal of 1809408 is 8049081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1809403) and next prime (1809413).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809403) 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, 58353 + ... + 58383.

2^1809408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1809408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2620160).

1809408 is an abundant number, since it is smaller than the sum of its proper divisors (3430912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1809408 is a wasteful number, since it uses less digits than its factorization.

1809408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1809408 is about 1345.1423716470. The cubic root of 1809408 is about 121.8556026986.

The spelling of 1809408 in words is "one million, eight hundred nine thousand, four hundred eight".