142828721 has 8 divisors (see below), whose sum is σ = 163479360. Its totient is φ = 122239728.

The previous prime is 142828703. The next prime is 142828727. The reversal of 142828721 is 127828241.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142828721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142828727) 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, 10331 + ... + 19808.

It is an arithmetic number, because the mean of its divisors is an integer number (20434920).

Almost surely, 2^142828721 is an apocalyptic number.

It is an amenable number.

142828721 is a deficient number, since it is larger than the sum of its proper divisors (20650639).

142828721 is an equidigital number, since it uses as much as digits as its factorization.

142828721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30823.

The product of its digits is 14336, while the sum is 35.

The square root of 142828721 is about 11951.0970626131. The cubic root of 142828721 is about 522.7232881873.

The spelling of 142828721 in words is "one hundred forty-two million, eight hundred twenty-eight thousand, seven hundred twenty-one".