840863944 has 16 divisors (see below), whose sum is σ = 1584791820. Its totient is φ = 418252800.

The previous prime is 840863927. The next prime is 840863951. The reversal of 840863944 is 449368048.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 777852100 + 63011844 = 27890^2 + 7938^2 .

It is a junction number, because it is equal to n+sod(n) for n = 840863894 and 840863903.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270757 + ... + 273844.

Almost surely, 2^840863944 is an apocalyptic number.

It is an amenable number.

840863944 is a deficient number, since it is larger than the sum of its proper divisors (743927876).

840863944 is a wasteful number, since it uses less digits than its factorization.

840863944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544800 (or 544796 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 840863944 is about 28997.6541120140. The cubic root of 840863944 is about 943.8621632753.

The spelling of 840863944 in words is "eight hundred forty million, eight hundred sixty-three thousand, nine hundred forty-four".