1244320040 has 64 divisors (see below), whose sum is σ = 2851545600. Its totient is φ = 488581632.

The previous prime is 1244320037. The next prime is 1244320043. The reversal of 1244320040 is 400234421.

It is an interprime number because it is at equal distance from previous prime (1244320037) and next prime (1244320043).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1244319994 and 1244320021.

It is not an unprimeable number, because it can be changed into a prime (1244320043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696989 + ... + 698771.

It is an arithmetic number, because the mean of its divisors is an integer number (44555400).

Almost surely, 2^1244320040 is an apocalyptic number.

1244320040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1244320040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425772800).

1244320040 is an abundant number, since it is smaller than the sum of its proper divisors (1607225560).

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

1244320040 is a wasteful number, since it uses less digits than its factorization.

1244320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1244320040 is about 35274.9208361975. The cubic root of 1244320040 is about 1075.5832537098.

Adding to 1244320040 its reverse (400234421), we get a palindrome (1644554461).

The spelling of 1244320040 in words is "one billion, two hundred forty-four million, three hundred twenty thousand, forty".