142281978 has 8 divisors (see below), whose sum is σ = 284563968. Its totient is φ = 47427324.

The previous prime is 142281977. The next prime is 142281989. The reversal of 142281978 is 879182241.

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

142281978 is an admirable number.

It is a super-2 number, since 2×142281978² = 40488322527184968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (142281973) 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, 11856826 + ... + 11856837.

It is an arithmetic number, because the mean of its divisors is an integer number (35570496).

Almost surely, 2^142281978 is an apocalyptic number.

142281978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

142281978 is a wasteful number, since it uses less digits than its factorization.

142281978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23713668.

The product of its digits is 64512, while the sum is 42.

The square root of 142281978 is about 11928.2009540416. The cubic root of 142281978 is about 522.0554469074.

The spelling of 142281978 in words is "one hundred forty-two million, two hundred eighty-one thousand, nine hundred seventy-eight".