840740008 has 8 divisors (see below), whose sum is σ = 1576387530. Its totient is φ = 420370000.

The previous prime is 840739997. The next prime is 840740009. The reversal of 840740008 is 800047048.

It can be written as a sum of positive squares in only one way, i.e., 778298404 + 62441604 = 27898^2 + 7902^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×840740008² = 1413687522103680128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (840740009) 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 as a sum of consecutive naturals, namely, 52546243 + ... + 52546258.

Almost surely, 2^840740008 is an apocalyptic number.

It is an amenable number.

840740008 is a deficient number, since it is larger than the sum of its proper divisors (735647522).

840740008 is a wasteful number, since it uses less digits than its factorization.

840740008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105092507 (or 105092503 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 840740008 is about 28995.5170328104. The cubic root of 840740008 is about 943.8157886509.

The spelling of 840740008 in words is "eight hundred forty million, seven hundred forty thousand, eight".