142675721 has 4 divisors (see below), whose sum is σ = 143938452. Its totient is φ = 141412992.

The previous prime is 142675711. The next prime is 142675751. The reversal of 142675721 is 127576241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64176121 + 78499600 = 8011^2 + 8860^2 .

It is a cyclic number.

It is not a de Polignac number, because 142675721 - 2⁶ = 142675657 is a prime.

It is a super-2 number, since 2×142675721² = 40712722725739682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142675711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631196 + ... + 631421.

It is an arithmetic number, because the mean of its divisors is an integer number (35984613).

Almost surely, 2^142675721 is an apocalyptic number.

It is an amenable number.

142675721 is a deficient number, since it is larger than the sum of its proper divisors (1262731).

142675721 is a wasteful number, since it uses less digits than its factorization.

142675721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262730.

The product of its digits is 23520, while the sum is 35.

The square root of 142675721 is about 11944.6942614702. The cubic root of 142675721 is about 522.5365721522.

The spelling of 142675721 in words is "one hundred forty-two million, six hundred seventy-five thousand, seven hundred twenty-one".