142009986 has 8 divisors (see below), whose sum is σ = 284019984. Its totient is φ = 47336660.

The previous prime is 142009961. The next prime is 142009997. The reversal of 142009986 is 689900241.

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

142009986 is an admirable number.

It is a super-2 number, since 2×142009986² = 40333672247440392, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11834160 + ... + 11834171.

It is an arithmetic number, because the mean of its divisors is an integer number (35502498).

Almost surely, 2^142009986 is an apocalyptic number.

142009986 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.

142009986 is a wasteful number, since it uses less digits than its factorization.

142009986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23668336.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 142009986 is about 11916.7942836990. The cubic root of 142009986 is about 521.7225739172.

The spelling of 142009986 in words is "one hundred forty-two million, nine thousand, nine hundred eighty-six".