142769781 has 72 divisors (see below), whose sum is σ = 275652000. Its totient is φ = 70217280.

The previous prime is 142769747. The next prime is 142769789. The reversal of 142769781 is 187967241.

It is a happy number.

142769781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 142769781 - 2¹⁰ = 142768757 is a prime.

It is a super-2 number, since 2×142769781² = 40766420733575922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142769789) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 91395 + ... + 92943.

It is an arithmetic number, because the mean of its divisors is an integer number (3828500).

Almost surely, 2^142769781 is an apocalyptic number.

142769781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142769781 is a deficient number, since it is larger than the sum of its proper divisors (132882219).

142769781 is a wasteful number, since it uses less digits than its factorization.

142769781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599 (or 1589 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 142769781 is about 11948.6309257588. The cubic root of 142769781 is about 522.6513755979.

The spelling of 142769781 in words is "one hundred forty-two million, seven hundred sixty-nine thousand, seven hundred eighty-one".