142127781 has 8 divisors (see below), whose sum is σ = 189688224. Its totient is φ = 94659600.

The previous prime is 142127761. The next prime is 142127813. The reversal of 142127781 is 187721241.

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

It is not a de Polignac number, because 142127781 - 2⁶ = 142127717 is a prime.

It is a super-2 number, since 2×142127781² = 40400612263967922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142127761) 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 in 7 ways as a sum of consecutive naturals, for example, 19386 + ... + 25691.

It is an arithmetic number, because the mean of its divisors is an integer number (23711028).

Almost surely, 2^142127781 is an apocalyptic number.

It is an amenable number.

142127781 is a deficient number, since it is larger than the sum of its proper divisors (47560443).

142127781 is a wasteful number, since it uses less digits than its factorization.

142127781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46131.

The product of its digits is 6272, while the sum is 33.

The square root of 142127781 is about 11921.7356538383. The cubic root of 142127781 is about 521.8667875457.

The spelling of 142127781 in words is "one hundred forty-two million, one hundred twenty-seven thousand, seven hundred eighty-one".