1993814540 has 24 divisors (see below), whose sum is σ = 4284384720. Its totient is φ = 778978368.

The previous prime is 1993814527. The next prime is 1993814623. The reversal of 1993814540 is 454183991.

It is a junction number, because it is equal to n+sod(n) for n = 1993814491 and 1993814500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1158335 + ... + 1160054.

It is an arithmetic number, because the mean of its divisors is an integer number (178516030).

Almost surely, 2^1993814540 is an apocalyptic number.

1993814540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1993814540 is an abundant number, since it is smaller than the sum of its proper divisors (2290570180).

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

1993814540 is a wasteful number, since it uses less digits than its factorization.

1993814540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318441 (or 2318439 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 1993814540 is about 44652.1504521339. The cubic root of 1993814540 is about 1258.6208433668.

The spelling of 1993814540 in words is "one billion, nine hundred ninety-three million, eight hundred fourteen thousand, five hundred forty".