840408998 has 16 divisors (see below), whose sum is σ = 1481000976. Its totient is φ = 352619040.

The previous prime is 840408979. The next prime is 840409001. The reversal of 840408998 is 899804048.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1468961 + ... + 1469532.

It is an arithmetic number, because the mean of its divisors is an integer number (92562561).

Almost surely, 2^840408998 is an apocalyptic number.

840408998 is a deficient number, since it is larger than the sum of its proper divisors (640591978).

840408998 is a wasteful number, since it uses less digits than its factorization.

840408998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938519.

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 840408998 is about 28989.8085195470. The cubic root of 840408998 is about 943.6919083112.

The spelling of 840408998 in words is "eight hundred forty million, four hundred eight thousand, nine hundred ninety-eight".