1215143 has 4 divisors (see below), whose sum is σ = 1286640. Its totient is φ = 1143648.

The previous prime is 1215133. The next prime is 1215157. The reversal of 1215143 is 3415121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3415121 = 811 ⋅4211.

It is a cyclic number.

It is not a de Polignac number, because 1215143 - 2⁶ = 1215079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 71479 = 1215143 / (1 + 2 + 1 + 5 + 1 + 4 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215103) 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, 35723 + ... + 35756.

It is an arithmetic number, because the mean of its divisors is an integer number (321660).

2^1215143 is an apocalyptic number.

1215143 is a deficient number, since it is larger than the sum of its proper divisors (71497).

1215143 is an equidigital number, since it uses as much as digits as its factorization.

1215143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71496.

The product of its digits is 120, while the sum is 17.

The square root of 1215143 is about 1102.3352484612. The cubic root of 1215143 is about 106.7109852729.

The spelling of 1215143 in words is "one million, two hundred fifteen thousand, one hundred forty-three".