1244406240 has 960 divisors, whose sum is σ = 5795919360. Its totient is φ = 243855360.

The previous prime is 1244406223. The next prime is 1244406271. The reversal of 1244406240 is 426044421.

It is a happy number.

1244406240 is a `hidden beast` number, since 12 + 4 + 4 + 406 + 240 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 28939659 + ... + 28939701.

It is an arithmetic number, because the mean of its divisors is an integer number (6037416).

Almost surely, 2^1244406240 is an apocalyptic number.

1244406240 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 1244406240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2897959680).

1244406240 is an abundant number, since it is smaller than the sum of its proper divisors (4551513120).

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

1244406240 is a wasteful number, since it uses less digits than its factorization.

1244406240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 1244406240 is about 35276.1426462702. The cubic root of 1244406240 is about 1075.6080900683.

The spelling of 1244406240 in words is "one billion, two hundred forty-four million, four hundred six thousand, two hundred forty".