1244997864 has 128 divisors (see below), whose sum is σ = 3819888000. Its totient is φ = 377213760.

The previous prime is 1244997823. The next prime is 1244997883. The reversal of 1244997864 is 4687994421.

1244997864 is a `hidden beast` number, since 1 + 24 + 499 + 78 + 64 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1244997864.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189222 + ... + 195690.

It is an arithmetic number, because the mean of its divisors is an integer number (29842875).

Almost surely, 2^1244997864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1244997864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909944000).

1244997864 is an abundant number, since it is smaller than the sum of its proper divisors (2574890136).

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

1244997864 is an equidigital number, since it uses as much as digits as its factorization.

1244997864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6507 (or 6485 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 1244997864 is about 35284.5272605430. The cubic root of 1244997864 is about 1075.7785206774.

The spelling of 1244997864 in words is "one billion, two hundred forty-four million, nine hundred ninety-seven thousand, eight hundred sixty-four".