1244929881 has 36 divisors (see below), whose sum is σ = 1827976752. Its totient is φ = 753296544.

The previous prime is 1244929859. The next prime is 1244929883. The reversal of 1244929881 is 1889294421.

It is not a de Polignac number, because 1244929881 - 2⁶ = 1244929817 is a prime.

It is a super-2 number, since 2×1244929881² = 3099700817213348322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1244929881.

It is not an unprimeable number, because it can be changed into a prime (1244929883) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2275650 + ... + 2276196.

It is an arithmetic number, because the mean of its divisors is an integer number (50777132).

Almost surely, 2^1244929881 is an apocalyptic number.

It is an amenable number.

1244929881 is a deficient number, since it is larger than the sum of its proper divisors (583046871).

1244929881 is an equidigital number, since it uses as much as digits as its factorization.

1244929881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 630 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 1244929881 is about 35283.5638931217. The cubic root of 1244929881 is about 1075.7589393902.

The spelling of 1244929881 in words is "one billion, two hundred forty-four million, nine hundred twenty-nine thousand, eight hundred eighty-one".