840006434 has 8 divisors (see below), whose sum is σ = 1283783580. Its totient is φ = 412078576.

The previous prime is 840006421. The next prime is 840006439. The reversal of 840006434 is 434600048.

It can be written as a sum of positive squares in 2 ways, for example, as 827425225 + 12581209 = 28765^2 + 3547^2 .

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

It is a super-2 number, since 2×840006434² = 1411221618322792712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840006397 and 840006406.

It is not an unprimeable number, because it can be changed into a prime (840006439) 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 3 ways as a sum of consecutive naturals, for example, 3962189 + ... + 3962400.

Almost surely, 2^840006434 is an apocalyptic number.

840006434 is a deficient number, since it is larger than the sum of its proper divisors (443777146).

840006434 is a wasteful number, since it uses less digits than its factorization.

840006434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924644.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 840006434 is about 28982.8644892116. The cubic root of 840006434 is about 943.5412050764.

The spelling of 840006434 in words is "eight hundred forty million, six thousand, four hundred thirty-four".