1806640654 has 16 divisors (see below), whose sum is σ = 3335336928. Its totient is φ = 714714912.

The previous prime is 1806640621. The next prime is 1806640681. The reversal of 1806640654 is 4560466081.

It is a happy 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, 4963117 + ... + 4963480.

It is an arithmetic number, because the mean of its divisors is an integer number (208458558).

Almost surely, 2^1806640654 is an apocalyptic number.

1806640654 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1806640654 is a deficient number, since it is larger than the sum of its proper divisors (1528696274).

1806640654 is a wasteful number, since it uses less digits than its factorization.

1806640654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9926619.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 1806640654 is about 42504.5956809378. The cubic root of 1806640654 is about 1217.9344817509.

The spelling of 1806640654 in words is "one billion, eight hundred six million, six hundred forty thousand, six hundred fifty-four".