1801215 has 24 divisors (see below), whose sum is σ = 3363360. Its totient is φ = 886464.

The previous prime is 1801213. The next prime is 1801223. The reversal of 1801215 is 5121081.

It is not a de Polignac number, because 1801215 - 2¹ = 1801213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 955 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (140140).

2^1801215 is an apocalyptic number.

1801215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1801215 is a deficient number, since it is larger than the sum of its proper divisors (1562145).

1801215 is a wasteful number, since it uses less digits than its factorization.

1801215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103 (or 3100 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1801215 is about 1342.0935138805. The cubic root of 1801215 is about 121.6714036645.

Adding to 1801215 its reverse (5121081), we get a palindrome (6922296).

It can be divided in two parts, 1801 and 215, that added together give a triangular number (2016 = T₆₃).

The spelling of 1801215 in words is "one million, eight hundred one thousand, two hundred fifteen".