1243040505 has 16 divisors (see below), whose sum is σ = 2272988544. Its totient is φ = 568247040.

The previous prime is 1243040503. The next prime is 1243040531. The reversal of 1243040505 is 5050403421.

It is not a de Polignac number, because 1243040505 - 2¹ = 1243040503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243040503) 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, 5919136 + ... + 5919345.

It is an arithmetic number, because the mean of its divisors is an integer number (142061784).

Almost surely, 2^1243040505 is an apocalyptic number.

1243040505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243040505 is a deficient number, since it is larger than the sum of its proper divisors (1029948039).

1243040505 is a wasteful number, since it uses less digits than its factorization.

1243040505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11838496.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 1243040505 is about 35256.7795608164. The cubic root of 1243040505 is about 1075.2144529792.

Adding to 1243040505 its reverse (5050403421), we get a palindrome (6293443926).

The spelling of 1243040505 in words is "one billion, two hundred forty-three million, forty thousand, five hundred five".