It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 705390.
It is a congruent number.
It is an unprimeable number.
2705390 is an apocalyptic number.
705390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
705390 is a wasteful number, since it uses less digits than its factorization.
705390 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3376.
The square root of 705390 is about 839.8749906980. The cubic root of 705390 is about 89.0177130927.
Adding to 705390 its reverse (93507), we get a palindrome (798897).
The spelling of 705390 in words is "seven hundred five thousand, three hundred ninety".