142720891 has 8 divisors (see below), whose sum is σ = 146467440. Its totient is φ = 139013472.

The previous prime is 142720883. The next prime is 142720927. The reversal of 142720891 is 198027241.

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

It is a cyclic number.

It is not a de Polignac number, because 142720891 - 2³ = 142720883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142720841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2320 + ... + 17053.

It is an arithmetic number, because the mean of its divisors is an integer number (18308430).

Almost surely, 2^142720891 is an apocalyptic number.

142720891 is a deficient number, since it is larger than the sum of its proper divisors (3746549).

142720891 is a wasteful number, since it uses less digits than its factorization.

142720891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19565.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 142720891 is about 11946.5849095045. The cubic root of 142720891 is about 522.5917099766.

The spelling of 142720891 in words is "one hundred forty-two million, seven hundred twenty thousand, eight hundred ninety-one".