1993540 has 24 divisors (see below), whose sum is σ = 4213440. Its totient is φ = 792288.

The previous prime is 1993531. The next prime is 1993553. The reversal of 1993540 is 453991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5071 + ... + 5449.

It is an arithmetic number, because the mean of its divisors is an integer number (175560).

2^1993540 is an apocalyptic number.

1993540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1993540 is an abundant number, since it is smaller than the sum of its proper divisors (2219900).

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

1993540 is a wasteful number, since it uses less digits than its factorization.

1993540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1993540 is about 1411.9277601917. The cubic root of 1993540 is about 125.8563071757.

The spelling of 1993540 in words is "one million, nine hundred ninety-three thousand, five hundred forty".