1243941918 has 64 divisors (see below), whose sum is σ = 2679505920. Its totient is φ = 383611392.

The previous prime is 1243941917. The next prime is 1243941931. The reversal of 1243941918 is 8191493421.

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 1243941918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243941911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1754148 + ... + 1754856.

It is an arithmetic number, because the mean of its divisors is an integer number (41867280).

Almost surely, 2^1243941918 is an apocalyptic number.

1243941918 is an abundant number, since it is smaller than the sum of its proper divisors (1435564002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243941918 is a wasteful number, since it uses less digits than its factorization.

1243941918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001.

The product of its digits is 62208, while the sum is 42.

The square root of 1243941918 is about 35269.5607854705. The cubic root of 1243941918 is about 1075.4742938279.

The spelling of 1243941918 in words is "one billion, two hundred forty-three million, nine hundred forty-one thousand, nine hundred eighteen".