1993404 has 48 divisors (see below), whose sum is σ = 5600000. Its totient is φ = 539136.

The previous prime is 1993367. The next prime is 1993417. The reversal of 1993404 is 4043991.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 972 + ... + 2220.

2^1993404 is an apocalyptic number.

1993404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1993404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2800000).

1993404 is an abundant number, since it is smaller than the sum of its proper divisors (3606596).

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

1993404 is a wasteful number, since it uses less digits than its factorization.

1993404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1993404 is about 1411.8795982661. The cubic root of 1993404 is about 125.8534451234.

The spelling of 1993404 in words is "one million, nine hundred ninety-three thousand, four hundred four".