1801405 has 8 divisors (see below), whose sum is σ = 2288952. Its totient is φ = 1356288.

The previous prime is 1801403. The next prime is 1801411. The reversal of 1801405 is 5041081.

It can be written as a sum of positive squares in 4 ways, for example, as 51076 + 1750329 = 226^2 + 1323^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1801405 - 2¹ = 1801403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801403) 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, 10512 + ... + 10681.

It is an arithmetic number, because the mean of its divisors is an integer number (286119).

2^1801405 is an apocalyptic number.

It is an amenable number.

1801405 is a deficient number, since it is larger than the sum of its proper divisors (487547).

1801405 is a wasteful number, since it uses less digits than its factorization.

1801405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21215.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1801405 is about 1342.1642969473. The cubic root of 1801405 is about 121.6756816572.

Adding to 1801405 its reverse (5041081), we get a palindrome (6842486).

The spelling of 1801405 in words is "one million, eight hundred one thousand, four hundred five".