1243005 has 16 divisors (see below), whose sum is σ = 2004480. Its totient is φ = 657728.

The previous prime is 1243003. The next prime is 1243013. The reversal of 1243005 is 5003421.

It is a cyclic number.

It is not a de Polignac number, because 1243005 - 2¹ = 1243003 is a prime.

It is a super-2 number, since 2×1243005² = 3090122860050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2356 + ... + 2834.

It is an arithmetic number, because the mean of its divisors is an integer number (125280).

2^1243005 is an apocalyptic number.

1243005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243005 is a deficient number, since it is larger than the sum of its proper divisors (761475).

1243005 is a wasteful number, since it uses less digits than its factorization.

1243005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 1243005 is about 1114.9013409266. The cubic root of 1243005 is about 107.5204215755.

Adding to 1243005 its reverse (5003421), we get a palindrome (6246426).

The spelling of 1243005 in words is "one million, two hundred forty-three thousand, five".