1215189 has 8 divisors (see below), whose sum is σ = 1800320. Its totient is φ = 810108.

The previous prime is 1215173. The next prime is 1215197. The reversal of 1215189 is 9815121.

It is not a de Polignac number, because 1215189 - 2⁴ = 1215173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 45007 = 1215189 / (1 + 2 + 1 + 5 + 1 + 8 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22477 + ... + 22530.

It is an arithmetic number, because the mean of its divisors is an integer number (225040).

2^1215189 is an apocalyptic number.

It is an amenable number.

1215189 is a deficient number, since it is larger than the sum of its proper divisors (585131).

1215189 is an equidigital number, since it uses as much as digits as its factorization.

1215189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45016 (or 45010 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1215189 is about 1102.3561130597. The cubic root of 1215189 is about 106.7123317930.

The spelling of 1215189 in words is "one million, two hundred fifteen thousand, one hundred eighty-nine".