1215165 has 32 divisors (see below), whose sum is σ = 2267136. Its totient is φ = 544320.

The previous prime is 1215161. The next prime is 1215167. The reversal of 1215165 is 5615121.

It is not a de Polignac number, because 1215165 - 2² = 1215161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

1215165 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7374 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (70848).

2^1215165 is an apocalyptic number.

1215165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215165 is a deficient number, since it is larger than the sum of its proper divisors (1051971).

1215165 is a wasteful number, since it uses less digits than its factorization.

1215165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249.

The product of its digits is 300, while the sum is 21.

The square root of 1215165 is about 1102.3452272315. The cubic root of 1215165 is about 106.7116292650.

The spelling of 1215165 in words is "one million, two hundred fifteen thousand, one hundred sixty-five".