1244021040 has 120 divisors (see below), whose sum is σ = 4219448688. Its totient is φ = 328435200.

The previous prime is 1244021039. The next prime is 1244021059. The reversal of 1244021040 is 401204421.

1244021040 is a `hidden beast` number, since 12 + 440 + 210 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64167 + ... + 81273.

Almost surely, 2^1244021040 is an apocalyptic number.

1244021040 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 1244021040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2109724344).

1244021040 is an abundant number, since it is smaller than the sum of its proper divisors (2975427648).

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

1244021040 is a wasteful number, since it uses less digits than its factorization.

1244021040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17227 (or 17218 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1244021040 is about 35270.6824430716. The cubic root of 1244021040 is about 1075.4970955016.

Adding to 1244021040 its reverse (401204421), we get a palindrome (1645225461).

The spelling of 1244021040 in words is "one billion, two hundred forty-four million, twenty-one thousand, forty".