1244640111 has 48 divisors (see below), whose sum is σ = 2015233920. Its totient is φ = 673617600.

The previous prime is 1244640071. The next prime is 1244640113. The reversal of 1244640111 is 1110464421.

It is not a de Polignac number, because 1244640111 - 2⁷ = 1244639983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244640113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 410760 + ... + 413778.

It is an arithmetic number, because the mean of its divisors is an integer number (41984040).

Almost surely, 2^1244640111 is an apocalyptic number.

1244640111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1244640111 is a deficient number, since it is larger than the sum of its proper divisors (770593809).

1244640111 is a wasteful number, since it uses less digits than its factorization.

1244640111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108 (or 3077 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1244640111 is about 35279.4573512689. The cubic root of 1244640111 is about 1075.6754683285.

The spelling of 1244640111 in words is "one billion, two hundred forty-four million, six hundred forty thousand, one hundred eleven".