1215899 has 2 divisors, whose sum is σ = 1215900. Its totient is φ = 1215898.

The previous prime is 1215881. The next prime is 1215917. The reversal of 1215899 is 9985121.

It is a balanced prime because it is at equal distance from previous prime (1215881) and next prime (1215917).

It is a cyclic number.

It is not a de Polignac number, because 1215899 - 2¹⁶ = 1150363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1215839) 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 as a sum of consecutive naturals, namely, 607949 + 607950.

It is an arithmetic number, because the mean of its divisors is an integer number (607950).

2^1215899 is an apocalyptic number.

1215899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215899 is an equidigital number, since it uses as much as digits as its factorization.

1215899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 35.

The square root of 1215899 is about 1102.6781035280. The cubic root of 1215899 is about 106.7331107293.

The spelling of 1215899 in words is "one million, two hundred fifteen thousand, eight hundred ninety-nine".