1243931904 has 180 divisors, whose sum is σ = 3739538880. Its totient is φ = 411264000.

The previous prime is 1243931903. The next prime is 1243931959. The reversal of 1243931904 is 4091393421.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243931903) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4955779 + ... + 4956029.

It is an arithmetic number, because the mean of its divisors is an integer number (20775216).

Almost surely, 2^1243931904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243931904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1869769440).

1243931904 is an abundant number, since it is smaller than the sum of its proper divisors (2495606976).

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

1243931904 is an equidigital number, since it uses as much as digits as its factorization.

1243931904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1243931904 is about 35269.4188214096. The cubic root of 1243931904 is about 1075.4714078870.

The spelling of 1243931904 in words is "one billion, two hundred forty-three million, nine hundred thirty-one thousand, nine hundred four".