1217142 has 12 divisors (see below), whose sum is σ = 2637180. Its totient is φ = 405708.

The previous prime is 1217141. The next prime is 1217143. The reversal of 1217142 is 2417121.

It is an interprime number because it is at equal distance from previous prime (1217141) and next prime (1217143).

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67619 = 1217142 / (1 + 2 + 1 + 7 + 1 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33792 + ... + 33827.

It is an arithmetic number, because the mean of its divisors is an integer number (219765).

2^1217142 is an apocalyptic number.

1217142 is an abundant number, since it is smaller than the sum of its proper divisors (1420038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1217142 is a wasteful number, since it uses less digits than its factorization.

1217142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67627 (or 67624 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 1217142 is about 1103.2415873235. The cubic root of 1217142 is about 106.7694690325.

The spelling of 1217142 in words is "one million, two hundred seventeen thousand, one hundred forty-two".