142401986 has 4 divisors (see below), whose sum is σ = 213602982. Its totient is φ = 71200992.

The previous prime is 142401967. The next prime is 142401989. The reversal of 142401986 is 689104241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689104241 = 7 ⋅98443463.

It can be written as a sum of positive squares in only one way, i.e., 117050761 + 25351225 = 10819^2 + 5035^2 .

It is not an unprimeable number, because it can be changed into a prime (142401989) by changing a digit.

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 as a sum of consecutive naturals, namely, 35600495 + ... + 35600498.

Almost surely, 2^142401986 is an apocalyptic number.

142401986 is a deficient number, since it is larger than the sum of its proper divisors (71200996).

142401986 is an equidigital number, since it uses as much as digits as its factorization.

142401986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71200995.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 142401986 is about 11933.2303254400. The cubic root of 142401986 is about 522.2021818744.

The spelling of 142401986 in words is "one hundred forty-two million, four hundred one thousand, nine hundred eighty-six".