142385781 has 8 divisors (see below), whose sum is σ = 190151104. Its totient is φ = 94772160.

The previous prime is 142385779. The next prime is 142385783. The reversal of 142385781 is 187583241.

142385781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (142385779) and next prime (142385783).

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

It is not a de Polignac number, because 142385781 - 2¹ = 142385779 is a prime.

It is a super-2 number, since 2×142385781² = 40547421261959922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142385783) 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, 35716 + ... + 39501.

It is an arithmetic number, because the mean of its divisors is an integer number (23768888).

Almost surely, 2^142385781 is an apocalyptic number.

It is an amenable number.

142385781 is a deficient number, since it is larger than the sum of its proper divisors (47765323).

142385781 is an equidigital number, since it uses as much as digits as its factorization.

142385781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75851.

The product of its digits is 53760, while the sum is 39.

The square root of 142385781 is about 11932.5513198142. The cubic root of 142385781 is about 522.1823726764.

The spelling of 142385781 in words is "one hundred forty-two million, three hundred eighty-five thousand, seven hundred eighty-one".