1243939770 has 48 divisors (see below), whose sum is σ = 3242060640. Its totient is φ = 330915552.

The previous prime is 1243939729. The next prime is 1243939771. The reversal of 1243939770 is 779393421.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1243939771) 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 23 ways as a sum of consecutive naturals, for example, 21217 + ... + 54203.

It is an arithmetic number, because the mean of its divisors is an integer number (67542930).

Almost surely, 2^1243939770 is an apocalyptic number.

1243939770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1243939770 is an abundant number, since it is smaller than the sum of its proper divisors (1998120870).

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

1243939770 is a wasteful number, since it uses less digits than its factorization.

1243939770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33419 (or 33416 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 1243939770 is about 35269.5303342701. The cubic root of 1243939770 is about 1075.4736747958.

The spelling of 1243939770 in words is "one billion, two hundred forty-three million, nine hundred thirty-nine thousand, seven hundred seventy".