1215099 has 12 divisors (see below), whose sum is σ = 1778400. Its totient is φ = 799344.

The previous prime is 1215083. The next prime is 1215103. The reversal of 1215099 is 9905121.

It is a happy number.

It is not a de Polignac number, because 1215099 - 2⁴ = 1215083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215029) 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 11 ways as a sum of consecutive naturals, for example, 144 + ... + 1565.

It is an arithmetic number, because the mean of its divisors is an integer number (148200).

2^1215099 is an apocalyptic number.

1215099 is a deficient number, since it is larger than the sum of its proper divisors (563301).

1215099 is a wasteful number, since it uses less digits than its factorization.

1215099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794 (or 1791 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 1215099 is about 1102.3152906496. The cubic root of 1215099 is about 106.7096972653.

The spelling of 1215099 in words is "one million, two hundred fifteen thousand, ninety-nine".