840678922 has 4 divisors (see below), whose sum is σ = 1261018386. Its totient is φ = 420339460.

The previous prime is 840678901. The next prime is 840678931. The reversal of 840678922 is 229876048.

840678922 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 803212281 + 37466641 = 28341^2 + 6121^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210169729 + ... + 210169732.

Almost surely, 2^840678922 is an apocalyptic number.

840678922 is a deficient number, since it is larger than the sum of its proper divisors (420339464).

840678922 is a wasteful number, since it uses less digits than its factorization.

840678922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420339463.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 840678922 is about 28994.4636439442. The cubic root of 840678922 is about 943.7929296905.

The spelling of 840678922 in words is "eight hundred forty million, six hundred seventy-eight thousand, nine hundred twenty-two".