840006436 has 12 divisors (see below), whose sum is σ = 1471617280. Its totient is φ = 419544360.

The previous prime is 840006421. The next prime is 840006439. The reversal of 840006436 is 634600048.

It is a super-2 number, since 2×840006436² = 1411221625042844192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840006398 and 840006407.

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, 110580 + ... + 117931.

Almost surely, 2^840006436 is an apocalyptic number.

It is an amenable number.

840006436 is a deficient number, since it is larger than the sum of its proper divisors (631610844).

840006436 is a wasteful number, since it uses less digits than its factorization.

840006436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229434 (or 229432 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 840006436 is about 28982.8645237147. The cubic root of 840006436 is about 943.5412058253.

The spelling of 840006436 in words is "eight hundred forty million, six thousand, four hundred thirty-six".