1244723540 has 24 divisors (see below), whose sum is σ = 2614582152. Its totient is φ = 497763200.

The previous prime is 1244723539. The next prime is 1244723581. The reversal of 1244723540 is 453274421.

It can be written as a sum of positive squares in 4 ways, for example, as 62188996 + 1182534544 = 7886^2 + 34388^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1244723497 and 1244723506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153590 + ... + 161490.

It is an arithmetic number, because the mean of its divisors is an integer number (108940923).

Almost surely, 2^1244723540 is an apocalyptic number.

1244723540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244723540 is an abundant number, since it is smaller than the sum of its proper divisors (1369858612).

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

1244723540 is a wasteful number, since it uses less digits than its factorization.

1244723540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15787 (or 15785 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 1244723540 is about 35280.6397334289. The cubic root of 1244723540 is about 1075.6995021899.

Adding to 1244723540 its reverse (453274421), we get a palindrome (1697997961).

The spelling of 1244723540 in words is "one billion, two hundred forty-four million, seven hundred twenty-three thousand, five hundred forty".