1215915 has 16 divisors (see below), whose sum is σ = 1966848. Its totient is φ = 641376.

The previous prime is 1215899. The next prime is 1215917. The reversal of 1215915 is 5195121.

It is not a de Polignac number, because 1215915 - 2⁴ = 1215899 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1215917) 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 15 ways as a sum of consecutive naturals, for example, 1152 + ... + 1938.

It is an arithmetic number, because the mean of its divisors is an integer number (122928).

2^1215915 is an apocalyptic number.

1215915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215915 is a deficient number, since it is larger than the sum of its proper divisors (750933).

1215915 is a wasteful number, since it uses less digits than its factorization.

1215915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898.

The product of its digits is 450, while the sum is 24.

The square root of 1215915 is about 1102.6853585679. The cubic root of 1215915 is about 106.7335788938.

The spelling of 1215915 in words is "one million, two hundred fifteen thousand, nine hundred fifteen".