142217244 has 72 divisors (see below), whose sum is σ = 389130560. Its totient is φ = 43535232.

The previous prime is 142217239. The next prime is 142217249. The reversal of 142217244 is 442712241.

It is an interprime number because it is at equal distance from previous prime (142217239) and next prime (142217249).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142217249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106509 + ... + 107835.

Almost surely, 2^142217244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142217244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194565280).

142217244 is an abundant number, since it is smaller than the sum of its proper divisors (246913316).

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

142217244 is a wasteful number, since it uses less digits than its factorization.

142217244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1574 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 142217244 is about 11925.4871598606. The cubic root of 142217244 is about 521.9762617469.

Adding to 142217244 its reverse (442712241), we get a palindrome (584929485).

The spelling of 142217244 in words is "one hundred forty-two million, two hundred seventeen thousand, two hundred forty-four".