142087721 has 8 divisors (see below), whose sum is σ = 151421184. Its totient is φ = 133017280.

The previous prime is 142087703. The next prime is 142087789. The reversal of 142087721 is 127780241.

It is a happy number.

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

It is not a de Polignac number, because 142087721 - 2⁶ = 142087657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142080721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64640 + ... + 66801.

It is an arithmetic number, because the mean of its divisors is an integer number (18927648).

Almost surely, 2^142087721 is an apocalyptic number.

It is an amenable number.

142087721 is a deficient number, since it is larger than the sum of its proper divisors (9333463).

142087721 is a wasteful number, since it uses less digits than its factorization.

142087721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131511.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 142087721 is about 11920.0554109450. The cubic root of 142087721 is about 521.8177519810.

The spelling of 142087721 in words is "one hundred forty-two million, eighty-seven thousand, seven hundred twenty-one".