840142040 has 32 divisors (see below), whose sum is σ = 2001516480. Its totient is φ = 316288512.

The previous prime is 840142027. The next prime is 840142087. The reversal of 840142040 is 40241048.

It is a junction number, because it is equal to n+sod(n) for n = 840141997 and 840142015.

It is a congruent number.

It is an unprimeable number.

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, 617072 + ... + 618431.

It is an arithmetic number, because the mean of its divisors is an integer number (62547390).

Almost surely, 2^840142040 is an apocalyptic number.

It is an amenable number.

840142040 is an abundant number, since it is smaller than the sum of its proper divisors (1161374440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840142040 is a wasteful number, since it uses less digits than its factorization.

840142040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235531 (or 1235527 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 840142040 is about 28985.2038116002. The cubic root of 840142040 is about 943.5919757051.

Adding to 840142040 its reverse (40241048), we get a palindrome (880383088).

The spelling of 840142040 in words is "eight hundred forty million, one hundred forty-two thousand, forty".