1244720105 has 8 divisors (see below), whose sum is σ = 1521846792. Its totient is φ = 976987648.

The previous prime is 1244720101. The next prime is 1244720131. The reversal of 1244720105 is 5010274421.

It can be written as a sum of positive squares in 4 ways, for example, as 608066281 + 636653824 = 24659^2 + 25232^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1244720105 - 2² = 1244720101 is a prime.

It is a super-2 number, since 2×1244720105² = 3098656279582422050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244720101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2348264 + ... + 2348793.

It is an arithmetic number, because the mean of its divisors is an integer number (190230849).

Almost surely, 2^1244720105 is an apocalyptic number.

It is an amenable number.

1244720105 is a deficient number, since it is larger than the sum of its proper divisors (277126687).

1244720105 is an equidigital number, since it uses as much as digits as its factorization.

1244720105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4697115.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 1244720105 is about 35280.5910523052. The cubic root of 1244720105 is about 1075.6985126713.

Adding to 1244720105 its reverse (5010274421), we get a palindrome (6254994526).

The spelling of 1244720105 in words is "one billion, two hundred forty-four million, seven hundred twenty thousand, one hundred five".