142297981 has 8 divisors (see below), whose sum is σ = 162780800. Its totient is φ = 121853808.

The previous prime is 142297979. The next prime is 142297997. The reversal of 142297981 is 189792241.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142297981 - 2¹ = 142297979 is a prime.

It is a super-2 number, since 2×142297981² = 40497430793352722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142297931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281 + ... + 16918.

It is an arithmetic number, because the mean of its divisors is an integer number (20347600).

Almost surely, 2^142297981 is an apocalyptic number.

It is an amenable number.

142297981 is a deficient number, since it is larger than the sum of its proper divisors (20482819).

142297981 is a wasteful number, since it uses less digits than its factorization.

142297981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19323.

The product of its digits is 72576, while the sum is 43.

The square root of 142297981 is about 11928.8717404455. The cubic root of 142297981 is about 522.0750187001.

The spelling of 142297981 in words is "one hundred forty-two million, two hundred ninety-seven thousand, nine hundred eighty-one".