1656840854 has 8 divisors (see below), whose sum is σ = 2515204440. Its totient is φ = 818439376.

The previous prime is 1656840853. The next prime is 1656840863. The reversal of 1656840854 is 4580486561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1656840799 and 1656840808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656840853) 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 in 3 ways as a sum of consecutive naturals, for example, 4990319 + ... + 4990650.

It is an arithmetic number, because the mean of its divisors is an integer number (314400555).

Almost surely, 2^1656840854 is an apocalyptic number.

1656840854 is a deficient number, since it is larger than the sum of its proper divisors (858363586).

1656840854 is an equidigital number, since it uses as much as digits as its factorization.

1656840854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9981054.

The product of its (nonzero) digits is 921600, while the sum is 47.

The square root of 1656840854 is about 40704.3100174908. The cubic root of 1656840854 is about 1183.2965498760.

The spelling of 1656840854 in words is "one billion, six hundred fifty-six million, eight hundred forty thousand, eight hundred fifty-four".