1993405 has 4 divisors (see below), whose sum is σ = 2392092. Its totient is φ = 1594720.

The previous prime is 1993367. The next prime is 1993417. The reversal of 1993405 is 5043991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5043991 = 1009 ⋅4999.

It can be written as a sum of positive squares in 2 ways, for example, as 285156 + 1708249 = 534^2 + 1307^2 .

It is not a de Polignac number, because 1993405 - 2¹¹ = 1991357 is a prime.

It is a Duffinian number.

1993405 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199336 + ... + 199345.

It is an arithmetic number, because the mean of its divisors is an integer number (598023).

2^1993405 is an apocalyptic number.

It is an amenable number.

1993405 is a deficient number, since it is larger than the sum of its proper divisors (398687).

1993405 is an equidigital number, since it uses as much as digits as its factorization.

1993405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398686.

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

The square root of 1993405 is about 1411.8799524039. The cubic root of 1993405 is about 125.8534661684.

The spelling of 1993405 in words is "one million, nine hundred ninety-three thousand, four hundred five".