142220986 has 4 divisors (see below), whose sum is σ = 213331482. Its totient is φ = 71110492.

The previous prime is 142220971. The next prime is 142220989. The reversal of 142220986 is 689022241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689022241 = 233 ⋅2957177.

It can be written as a sum of positive squares in only one way, i.e., 89208025 + 53012961 = 9445^2 + 7281^2 .

It is not an unprimeable number, because it can be changed into a prime (142220989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35555245 + ... + 35555248.

Almost surely, 2^142220986 is an apocalyptic number.

142220986 is a deficient number, since it is larger than the sum of its proper divisors (71110496).

142220986 is an equidigital number, since it uses as much as digits as its factorization.

142220986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71110495.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 142220986 is about 11925.6440496939. The cubic root of 142220986 is about 521.9808397620.

The spelling of 142220986 in words is "one hundred forty-two million, two hundred twenty thousand, nine hundred eighty-six".