142838781 has 8 divisors (see below), whose sum is σ = 194504064. Its totient is φ = 93199680.

The previous prime is 142838753. The next prime is 142838783. The reversal of 142838781 is 187838241.

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

It is not a de Polignac number, because 142838781 - 2⁷ = 142838653 is a prime.

It is a super-2 number, since 2×142838781² = 40805834715131922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142838783) 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, 506380 + ... + 506661.

It is an arithmetic number, because the mean of its divisors is an integer number (24313008).

Almost surely, 2^142838781 is an apocalyptic number.

It is an amenable number.

142838781 is a deficient number, since it is larger than the sum of its proper divisors (51665283).

142838781 is a wasteful number, since it uses less digits than its factorization.

142838781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013091.

The product of its digits is 86016, while the sum is 42.

The square root of 142838781 is about 11951.5179370656. The cubic root of 142838781 is about 522.7355603988.

The spelling of 142838781 in words is "one hundred forty-two million, eight hundred thirty-eight thousand, seven hundred eighty-one".