840678923 has 16 divisors (see below), whose sum is σ = 967898880. Its totient is φ = 715261536.

The previous prime is 840678901. The next prime is 840678931. The reversal of 840678923 is 329876048.

It is a cyclic number.

It is not a de Polignac number, because 840678923 - 2¹⁶ = 840613387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840678953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748040 + ... + 749162.

It is an arithmetic number, because the mean of its divisors is an integer number (60493680).

Almost surely, 2^840678923 is an apocalyptic number.

840678923 is a deficient number, since it is larger than the sum of its proper divisors (127219957).

840678923 is a wasteful number, since it uses less digits than its factorization.

840678923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 840678923 is about 28994.4636611888. The cubic root of 840678923 is about 943.7929300647.

The spelling of 840678923 in words is "eight hundred forty million, six hundred seventy-eight thousand, nine hundred twenty-three".