It is a semiprime because it is the product of two primes.
It is a de Polignac number, because none of the positive numbers 2k-7405 is a prime.
It is a Duffinian number.
7405 is a lucky number.
It is a plaindrome in base 9 and base 14.
It is a congruent number.
It is an unprimeable number.
27405 is an apocalyptic number.
It is an amenable number.
7405 is a wasteful number, since it uses less digits than its factorization.
7405 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1486.
The square root of 7405 is about 86.0523096727. The cubic root of 7405 is about 19.4913395687.
The spelling of 7405 in words is "seven thousand, four hundred five".