1851215 has 16 divisors (see below), whose sum is σ = 2436480. Its totient is φ = 1344000.

The previous prime is 1851203. The next prime is 1851217. The reversal of 1851215 is 5121581.

It is not a de Polignac number, because 1851215 - 2¹⁴ = 1834831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2090 + ... + 2840.

It is an arithmetic number, because the mean of its divisors is an integer number (152280).

2^1851215 is an apocalyptic number.

1851215 is a deficient number, since it is larger than the sum of its proper divisors (585265).

1851215 is a wasteful number, since it uses less digits than its factorization.

1851215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its digits is 400, while the sum is 23.

The square root of 1851215 is about 1360.5936204466. The cubic root of 1851215 is about 122.7869712470.

Adding to 1851215 its reverse (5121581), we get a palindrome (6972796).

The spelling of 1851215 in words is "one million, eight hundred fifty-one thousand, two hundred fifteen".