1684454840 has 32 divisors (see below), whose sum is σ = 3823573680. Its totient is φ = 667817472.

The previous prime is 1684454813. The next prime is 1684454857. The reversal of 1684454840 is 484544861.

It is a junction number, because it is equal to n+sod(n) for n = 1684454791 and 1684454800.

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, 181814 + ... + 190853.

Almost surely, 2^1684454840 is an apocalyptic number.

1684454840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684454840 is an abundant number, since it is smaller than the sum of its proper divisors (2139118840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1684454840 is a wasteful number, since it uses less digits than its factorization.

1684454840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372791 (or 372787 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 44.

The square root of 1684454840 is about 41042.1105695114. The cubic root of 1684454840 is about 1189.8342259015.

The spelling of 1684454840 in words is "one billion, six hundred eighty-four million, four hundred fifty-four thousand, eight hundred forty".