1215089 has 4 divisors (see below), whose sum is σ = 1225956. Its totient is φ = 1204224.

The previous prime is 1215083. The next prime is 1215103. The reversal of 1215089 is 9805121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 667489 = 740^2 + 817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215089 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5264 + ... + 5489.

It is an arithmetic number, because the mean of its divisors is an integer number (306489).

2^1215089 is an apocalyptic number.

It is an amenable number.

1215089 is a deficient number, since it is larger than the sum of its proper divisors (10867).

1215089 is a wasteful number, since it uses less digits than its factorization.

1215089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10866.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1215089 is about 1102.3107547330. The cubic root of 1215089 is about 106.7094045320.

The spelling of 1215089 in words is "one million, two hundred fifteen thousand, eighty-nine".