1243941816 has 64 divisors (see below), whose sum is σ = 3546093600. Its totient is φ = 360235008.

The previous prime is 1243941791. The next prime is 1243941817. The reversal of 1243941816 is 6181493421.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243941817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111961 + ... + 122568.

Almost surely, 2^1243941816 is an apocalyptic number.

It is an amenable number.

1243941816 is an abundant number, since it is smaller than the sum of its proper divisors (2302151784).

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

1243941816 is a wasteful number, since it uses less digits than its factorization.

1243941816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234568 (or 234564 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 1243941816 is about 35269.5593394644. The cubic root of 1243941816 is about 1075.4742644325.

The spelling of 1243941816 in words is "one billion, two hundred forty-three million, nine hundred forty-one thousand, eight hundred sixteen".