1243941909 has 16 divisors (see below), whose sum is σ = 1901004288. Its totient is φ = 708771312.

The previous prime is 1243941893. The next prime is 1243941911. The reversal of 1243941909 is 9091493421.

It is not a de Polignac number, because 1243941909 - 2⁴ = 1243941893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243941409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78067 + ... + 92640.

It is an arithmetic number, because the mean of its divisors is an integer number (118812768).

Almost surely, 2^1243941909 is an apocalyptic number.

It is an amenable number.

1243941909 is a deficient number, since it is larger than the sum of its proper divisors (657062379).

1243941909 is a wasteful number, since it uses less digits than its factorization.

1243941909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171064.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 1243941909 is about 35269.5606578817. The cubic root of 1243941909 is about 1075.4742912342.

The spelling of 1243941909 in words is "one billion, two hundred forty-three million, nine hundred forty-one thousand, nine hundred nine".